Bump mypy from 1.8.0 to 1.9.0 (#568)

Bumps [mypy](https://github.com/python/mypy) from 1.8.0 to 1.9.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.8.0...1.9.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-type: direct:development
  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>

requirements-dev.txt

@@ -5,4 +5,4 @@ flake8-bandit==4.1.1
 flake8-bugbear==24.2.6
 flake8-import-order==0.18.2
 flake8-requirements==2.1.0
-mypy==1.8.0; implementation_name=="cpython"
+mypy==1.9.0; implementation_name=="cpython"