Update dependency mypy to v1.12.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mypy (source, changelog)	==1.12.0 -> ==1.12.1

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Release Notes

python/mypy (mypy)

### [`v1.12.1`](https://redirect.github.com/python/mypy/blob/HEAD/CHANGELOG.md#Mypy-1121) [Compare Source](https://redirect.github.com/python/mypy/compare/v1.12.0...v1.12.1) - Fix crash when showing partially analyzed type in error message (Ivan Levkivskyi, PR [17961](https://redirect.github.com/python/mypy/pull/17961)) - Fix iteration over union (when self type is involved) (Shantanu, PR [17976](https://redirect.github.com/python/mypy/pull/17976)) - Fix type object with type var default in union context (Jukka Lehtosalo, PR [17991](https://redirect.github.com/python/mypy/pull/17991)) - Revert change to `os.path` stubs affecting use of `os.PathLike[Any]` (Shantanu, PR [17995](https://redirect.github.com/python/mypy/pull/17995))

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