Bump mypy from 1.11.2 to 1.12.1 (#636)

Bumps [mypy](https://github.com/python/mypy) from 1.11.2 to 1.12.1.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.11.2...v1.12.1)

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

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

requirements/syntax.txt

@@ -1,5 +1,5 @@
 -r base.txt
-mypy==1.11.2
+mypy==1.12.1
 pre-commit==4.0.1
 # mypy stubs and typesheds (https://mypy.readthedocs.io/en/latest/getting_started.html#library-stubs-and-typeshed)
 types-PyYAML==6.0.12.20240917