Bump mypy from 1.11.2 to 1.12.0 (#639)

Bumps [mypy](https://github.com/python/mypy) from 1.11.2 to 1.12.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.11.2...v1.12.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

mypy_requirements.txt

@@ -1,2 +1,2 @@
 # Requirements to run mypy itself. Mypy executable exists in a separate venv.
-mypy==1.11.2
+mypy==1.12.0