MNT: Don't rely on RcParams being a dict subclass in internal code #28730
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Eventually, we want to be able to remove the dict subclassing from RcParams, which will allow better initialization and handling.
We've publically announced that people should not rely on dict in https://matplotlib.org/stable/api/prev_api_changes/api_changes_3.7.0.html#rcparams-type
This is an internal cleanup step to remove the dict-assumption and a preparation for further refactoring.