Bump mkdocs-material from 9.5.4 to 9.5.6 in /.config

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.5.4 to 9.5.6.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.5.4...9.5.6)

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

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

.config/requirements.txt

@@ -34,7 +34,7 @@ mkdocs==1.5.3
 mkdocs-autorefs==0.5.0
 mkdocs-gen-files==0.5.0
 mkdocs-htmlproofer-plugin==1.0.0
-mkdocs-material==9.5.4
+mkdocs-material==9.5.6
 mkdocs-material-extensions==1.3.1
 mkdocs-minify-plugin==0.7.2
 mkdocs-monorepo-plugin==1.1.0