Backport PR #25240 on branch v3.7.x (Avoid calling vars() on arbitrary third-party manager_class.) - #25246

Backport PR #25240 on branch v3.7.x (Avoid calling vars() on arbitrary third-party manager_class.)#25246

rcomer merged 1 commit into

matplotlib:v3.7.xmatplotlib/matplotlib:v3.7.xfrom

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