Bump mypy from 1.6.0 to 1.6.1

Bumps [mypy](https://github.com/python/mypy) from 1.6.0 to 1.6.1.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.6.0...v1.6.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/testing.txt

@@ -10,4 +10,4 @@ pytest-icdiff==0.8
 ruff==0.0.292
 setuptools==68.2.2
 tox==4.11.3
-mypy==1.6.0
+mypy==1.6.1