Bump mkdocs-material from 9.6.20 to 9.7.6

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.6.20 to 9.7.6.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](https://github.com/squidfunk/mkdocs-material/compare/9.6.20...9.7.6)

---
updated-dependencies:
- dependency-name: mkdocs-material
  dependency-version: 9.7.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

docs/requirements.txt

@@ -1,5 +1,5 @@
 mkdocs==1.6.1
 mkdocs-autorefs==1.4.3
-mkdocs-material==9.6.20
+mkdocs-material==9.7.6
 mkdocs-material-extensions==1.3.1
 mkdocstrings==1.0.0