fix FuncAnimation class #29967
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fix FuncAnimation class #29967
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PR summary
Why is this change necessary?
To ensure the update function passed to FuncAnimation matches expected signatures and avoids runtime errors.
What problem does it solve?
It prevents type errors and ensures the animation updates frames correctly without freezing or crashing.
What is the reasoning for this implementation?
FuncAnimation requires different update function return types depending on blit, typing must reflect this to satisfy static checkers and runtime behavior.
Closes #29960
PR checklist