Update dependency mypy to v1.15.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mypy (changelog)	==1.14.1 -> ==1.15.0

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Release Notes

python/mypy (mypy)

v1.15.0

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[radarhere]

This is failing with a lint error

https://github.com/python-pillow/Pillow/actions/runs/13622251428/job/38073584609?pr=8791#step:8:17

src/PIL/TiffImagePlugin.py:407: error: Signature of "__hash__" incompatible
with supertype "Complex"  [override]
        def __hash__(self) -> int:
        ^
src/PIL/TiffImagePlugin.py:407: note:      Superclass:
src/PIL/TiffImagePlugin.py:407: note:          None
src/PIL/TiffImagePlugin.py:407: note:      Subclass:
src/PIL/TiffImagePlugin.py:407: note:          def __hash__(self) -> int

I don't think there is a solution. I asked about this at https://github.com/python/typeshed/pull/13286/files#r1942664879, but the author doesn't think there is a problem.

I'll push an ignore here, since I think that's the only thing we can do.

[renovate]

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