build(deps): bump mypy from 1.8.0 to 1.9.0 in /.github/workflows/style

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:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/style/requirements.txt

@@ -2,6 +2,6 @@ black==24.1.1
 clingo==5.6.2
 flake8==7.0.0
 isort==5.13.2
-mypy==1.8.0
+mypy==1.9.0
 types-six==1.16.21.9
 vermin==1.6.0