Bump mkdocs-material from 9.2.5 to 9.4.0

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.2.5 to 9.4.0.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.2.5...9.4.0)

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

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

requirements-test.txt

@@ -4,7 +4,7 @@ isort==5.12.0
 bandit==1.7.5
 mike==1.1.2
 markdown-include==0.8.1
-mkdocs-material==9.2.5
+mkdocs-material==9.4.0
 mkdocs-minify-plugin==0.7.1
 mkdocstrings==0.22.0
 ./util/mkdocs-redirects