Update dependency mypy to v1.12.1

[renovate]

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

Compare Source

• Fix crash when showing partially analyzed type in error message (Ivan Levkivskyi, PR 17961)
• Fix iteration over union (when self type is involved) (Shantanu, PR 17976)
• Fix type object with type var default in union context (Jukka Lehtosalo, PR 17991)
• Revert change to os.path stubs affecting use of os.PathLike[Any] (Shantanu, PR 17995)

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