Update mkdocs-material requirement from ~=9.1 to ~=9.2 (#644)

Updates the requirements on [mkdocs-material](https://github.com/squidfunk/mkdocs-material) to permit the latest version.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.1.0...9.2.5)

---
updated-dependencies:
- dependency-name: mkdocs-material
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements_docs.txt

@@ -1,5 +1,5 @@
 mike~=1.1
 mkdocs~=1.5
 mkdocs-awesome-pages-plugin~=2.9
-mkdocs-material~=9.1
+mkdocs-material~=9.2
 mkdocstrings[python-legacy]~=0.22.0