build(pip): (deps-dev): bump mkdocs from 1.4.0 to 1.4.2

Bumps [mkdocs](https://github.com/mkdocs/mkdocs) from 1.4.0 to 1.4.2.
- [Release notes](https://github.com/mkdocs/mkdocs/releases)
- [Commits](mkdocs/mkdocs@1.4.0...1.4.2)

---
updated-dependencies:
- dependency-name: mkdocs
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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