Backport PR #29920 on branch v3.10.x (Allow None in set_prop_cycle (in type hints)) - #29932

Backport PR #29920 on branch v3.10.x (Allow None in set_prop_cycle (in type hints))#29932

timhoffm merged 1 commit into

matplotlib:v3.10.xmatplotlib/matplotlib:v3.10.xfrom

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