Bump mkdocs-material from 9.5.7 to 9.5.9

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.5.7 to 9.5.9.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.5.7...9.5.9)

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

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

mkdocs_requirements.txt

@@ -1,5 +1,5 @@
 mkdocs==1.5.3
-mkdocs-material==9.5.7
+mkdocs-material==9.5.9
 mkdocs-section-index==0.3.8
 mkdocs-autorefs==0.5.0
 griffe==0.39.1