Backport PR #31825 on branch v3.11.x (Partially revert "Fix test_RcParams_class on Python 3.15") - #31841

Backport PR #31825 on branch v3.11.x (Partially revert "Fix test_RcParams_class on Python 3.15")#31841

QuLogic merged 1 commit into

matplotlib:v3.11.xmatplotlib/matplotlib:v3.11.xfrom

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