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](psf/black@22.3.0...22.6.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 Django>=2.2
 Wagtail>=2.8
 bandit==1.7.4
-black==22.3.0
+black==22.6.0
 flake8==4.0.1
 isort==5.10.1
 pydocstyle==6.1.1