MNT: Remove font-related deprecations from 3.10 by QuLogic · Pull Request #31879 · matplotlib/matplotlib

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PR checklist

• [n/a] "closes #0000" is in the body of the PR description to link the related issue
• new and changed code is tested
• [n/a] Plotting related features are demonstrated in an example
• New Features and API Changes are noted with a directive and release note
• Documentation complies with general and docstring guidelines

Hmm, it appears that FontProperties._from_any was implicitly relying on the family/fontconfig ambiguity, and that is used in a few places right now.