Bump mypy from 1.11.2 to 1.12.0 (#430)

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:development
  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-dev.txt

@@ -4,7 +4,7 @@ black==24.10.0; implementation_name=="cpython"
 flake8-bugbear==24.8.19; implementation_name=="cpython"
 flake8==7.1.1; implementation_name=="cpython"
 isort==5.13.2; implementation_name=="cpython"
-mypy==1.11.2; implementation_name=="cpython"
+mypy==1.12.0; implementation_name=="cpython"
 pyroma==4.2; implementation_name=="cpython"
 pytest-asyncio==0.24.0
 pytest-cov==5.0.0