Bump black from 23.3.0 to 23.9.1

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] <[email protected]>

requirements.txt

@@ -153,7 +153,7 @@ invoke==2.1.3
 coverage==7.2.7
 requests-toolbelt==1.0.0
 flake8==6.0.0
-black==23.3.0
+black==23.9.1
 pytest==7.4.0
 pytest-bdd==6.1.1
 splinter==0.19.0