[Bug]: Doc build is broken

### Bug summary

>     UserWarning: Could not render math expression \sum_{\substack{1\leq i\leq 3\\ 1\leq j\leq 5}}

e.g. in https://github.com/matplotlib/matplotlib/pull/29801.

I suspect this may be a bug in pyparsing 3.2.2, which was released today. Ping @ptmcg

### Code for reproduction

I've not yet created a minimal example from the docs, but can do so if additional insight is needed.

### Actual outcome

```
    Traceback (most recent call last):
      File "/home/circleci/project/lib/matplotlib/sphinxext/mathmpl.py", line 134, in latex2png
        depth = mathtext.math_to_image(
                ^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/project/lib/matplotlib/mathtext.py", line 134, in math_to_image
        width, height, depth, _, _ = parser.parse(s, dpi=72, prop=prop)
                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/project/lib/matplotlib/mathtext.py", line 86, in parse
        return self._parse_cached(s, dpi, prop, antialiased, load_glyph_flags)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/project/lib/matplotlib/mathtext.py", line 100, in _parse_cached
        box = self._parser.parse(s, fontset, fontsize, dpi)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/project/lib/matplotlib/_mathtext.py", line 2170, in parse
        result = self._expression.parseString(s)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/util.py", line 417, in _inner
        return fn(self, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 1207, in parse_string
        loc, tokens = self._parse(instring, 0)
                      ^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4197, in parseImpl
        loc, exprtokens = e._parse(instring, loc, do_actions)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 5232, in parseImpl
        return super().parseImpl(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 5131, in parseImpl
        loc, tokens = self_expr_parse(instring, loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4175, in parseImpl
        loc, resultlist = self.exprs[0]._parse(
                          ^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 892, in _parseNoCache
        tokens = fn(instring, tokens_start, ret_tokens)  # type: ignore [call-arg, arg-type]
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 280, in wrapper
        return func(*args[limit:])
               ^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/project/lib/matplotlib/_mathtext.py", line 2197, in math_string
        return self._math_expression.parseString(toks[0][1:-1], parseAll=True)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/util.py", line 417, in _inner
        return fn(self, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 1207, in parse_string
        loc, tokens = self._parse(instring, 0)
                      ^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 5131, in parseImpl
        loc, tokens = self_expr_parse(instring, loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 5666, in parseImpl
        return super().parseImpl(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4703, in parseImpl
        return self.expr._parse(instring, loc, do_actions, callPreParse=False)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4431, in parseImpl
        return e._parse(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4431, in parseImpl
        return e._parse(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4197, in parseImpl
        loc, exprtokens = e._parse(instring, loc, do_actions)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 5131, in parseImpl
        loc, tokens = self_expr_parse(instring, loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4186, in parseImpl
        loc, exprtokens = e._parse(instring, loc, do_actions)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 5666, in parseImpl
        return super().parseImpl(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4703, in parseImpl
        return self.expr._parse(instring, loc, do_actions, callPreParse=False)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4431, in parseImpl
        return e._parse(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4197, in parseImpl
        loc, exprtokens = e._parse(instring, loc, do_actions)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 5232, in parseImpl
        return super().parseImpl(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 5131, in parseImpl
        loc, tokens = self_expr_parse(instring, loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 5666, in parseImpl
        return super().parseImpl(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4703, in parseImpl
        return self.expr._parse(instring, loc, do_actions, callPreParse=False)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4431, in parseImpl
        return e._parse(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4431, in parseImpl
        return e._parse(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4175, in parseImpl
        loc, resultlist = self.exprs[0]._parse(
                          ^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 5366, in parseImpl
        loc, tokens = self_expr._parse(
                      ^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 5666, in parseImpl
        return super().parseImpl(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4703, in parseImpl
        return self.expr._parse(instring, loc, do_actions, callPreParse=False)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4431, in parseImpl
        return e._parse(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4186, in parseImpl
        loc, exprtokens = e._parse(instring, loc, do_actions)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4431, in parseImpl
        return e._parse(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 5666, in parseImpl
        return super().parseImpl(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4703, in parseImpl
        return self.expr._parse(instring, loc, do_actions, callPreParse=False)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4703, in parseImpl
        return self.expr._parse(instring, loc, do_actions, callPreParse=False)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4197, in parseImpl
        loc, exprtokens = e._parse(instring, loc, do_actions)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 5232, in parseImpl
        return super().parseImpl(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 5131, in parseImpl
        loc, tokens = self_expr_parse(instring, loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 853, in _parseNoCache
        loc, tokens = self.parseImpl(instring, pre_loc, do_actions)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 4431, in parseImpl
        return e._parse(instring, loc, do_actions)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 991, in _parseCache
        value = self._parseNoCache(instring, loc, do_actions, callPreParse)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 892, in _parseNoCache
        tokens = fn(instring, tokens_start, ret_tokens)  # type: ignore [call-arg, arg-type]
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/core.py", line 283, in wrapper
        ret = func(*args[limit:])
              ^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/pyparsing/helpers.py", line 549, in <lambda>
        lambda t: t[0].strip(ParserElement.DEFAULT_WHITE_CHARS)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    TypeError: 'str' object is not callable
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "/home/circleci/.local/lib/python3.12/site-packages/sphinx/util/parallel.py", line 83, in _process
        ret = func(arg)  # type: ignore[call-arg]
              ^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/sphinx/builders/__init__.py", line 774, in write_process
        self.write_doc(docname, doctree)
      File "/home/circleci/.local/lib/python3.12/site-packages/sphinx/builders/html/__init__.py", line 670, in write_doc
        self.docwriter.write(doctree, destination)
      File "/home/circleci/.local/lib/python3.12/site-packages/docutils/writers/__init__.py", line 80, in write
        self.translate()
      File "/home/circleci/.local/lib/python3.12/site-packages/sphinx/writers/html.py", line 36, in translate
        self.document.walkabout(visitor)
      File "/home/circleci/.local/lib/python3.12/site-packages/docutils/nodes.py", line 186, in walkabout
        if child.walkabout(visitor):
           ^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/docutils/nodes.py", line 186, in walkabout
        if child.walkabout(visitor):
           ^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/.local/lib/python3.12/site-packages/docutils/nodes.py", line 186, in walkabout
        if child.walkabout(visitor):
           ^^^^^^^^^^^^^^^^^^^^^^^^
      [Previous line repeated 1 more time]
      File "/home/circleci/.local/lib/python3.12/site-packages/docutils/nodes.py", line 178, in walkabout
        visitor.dispatch_visit(self)
      File "/home/circleci/.local/lib/python3.12/site-packages/sphinx/util/docutils.py", line 767, in dispatch_visit
        method(node)
      File "/home/circleci/project/lib/matplotlib/sphinxext/mathmpl.py", line 214, in visit_latex_math_html
        self.body.append(latex2html(node, source))
                         ^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/project/lib/matplotlib/sphinxext/mathmpl.py", line 158, in latex2html
        depth = latex2png(latex, dest, fontset, fontsize=fontsize)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/circleci/project/lib/matplotlib/sphinxext/mathmpl.py", line 137, in latex2png
        _api.warn_external(f"Could not render math expression {latex}")
      File "/home/circleci/project/lib/matplotlib/_api/__init__.py", line 391, in warn_external
        warnings.warn(message, category, **kwargs)
    UserWarning: Could not render math expression \sum_{\substack{1\leq i\leq 3\\ 1\leq j\leq 5}}
```

### Expected outcome

No error.

### Additional information

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### Operating system

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### Matplotlib Version

main

### Matplotlib Backend

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### Python version

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### Jupyter version

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### Installation

None

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[Bug]: Doc build is broken #29802

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Uh oh!

[Bug]: Doc build is broken #29802

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