build(deps): bump mkdocs-material from 9.1.17 to 9.2.2

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.1.17 to 9.2.2.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.1.17...9.2.2)

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

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

docs/requirements.txt

@@ -1,2 +1,2 @@
 mkdocs==1.4.3
-mkdocs-material==9.1.17
+mkdocs-material==9.2.2