allow arbitrary types in set.discard

[randolf-scholz]

Fixes #15271

[randolf-scholz]

Homeassistent error is harmless:

class _ComponentSet(set[str]):
    def discard(self, value: str) -> None:
        """Remove a component from the store."""
        raise NotImplementedError("_ComponentSet does not support discard, use remove")

they just need to update to object.

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉