Bump black from 23.3.0 to 23.9.1 in /.github/workflows

Bumps [black](https://github.com/psf/black) from 23.3.0 to 23.9.1.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@23.3.0...23.9.1)

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

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

.github/workflows/constraints.txt

@@ -1,5 +1,5 @@
 pip==23.1.2
 pre-commit==3.3.3
-black==23.3.0
+black==23.9.1
 flake8==6.0.0
 reorder-python-imports==3.10.0