Bump black from 22.3.0 to 22.6.0 (#392)

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](psf/black@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>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements-dev.txt

@@ -6,4 +6,4 @@ sphinx>=2
 sphinx_rtd_theme
 pypandoc
 twine
-black==22.3.0
+black==22.6.0