Bump mkdocs-material from 9.3.2 to 9.4.2

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.3.2 to 9.4.2.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.3.2...9.4.2)

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

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

pyproject.toml

@@ -46,7 +46,7 @@ dev-mkdocs = [
   "mike == 1.1.2",
   "mkdocs-gen-files == 0.5.0",
   "mkdocs-literate-nav == 0.6.1",
-  "mkdocs-material == 9.3.2",
+  "mkdocs-material == 9.4.2",
   "mkdocs-section-index == 0.3.7",
   "mkdocstrings[python] == 0.23.0",
   "frequenz-repo-config[lib] == 0.5.2",