gh-134873: fix various quadratic worst-time complexities in `_header_value_parser.py` [WIP]#134947

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picnixz wants to merge 3 commits intopython:mainfrom

picnixz:fix/email/dos-134873

Commits on May 30, 2025

fix quadratic worst-time complexity in `_header_value_parser.py`
picnixz
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Commits on May 31, 2025

fix quadratic worst-time complexity in `_header_value_parser.py`
picnixz
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Commits on Jun 2, 2025

fixup
picnixz
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