Bump black from 22.3.0 to 22.6.0

Bumps [black](https://github.com/psf/black) from 22.3.0 to 22.6.0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/compare/22.3.0...22.6.0)

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

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

requirements-dev.txt

@@ -1,7 +1,7 @@
 mock==4.0.3
 nose2[coverage_plugin]==0.11.0
 cov-core==1.15.0
-black==22.3.0
+black==22.6.0
 pycodestyle==2.8.0
 pylint==2.14.4
 splinter==0.18.0