Bump mkdocs-material from 9.5.31 to 9.6.15

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.5.31 to 9.6.15.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.5.31...9.6.15)

---
updated-dependencies:
- dependency-name: mkdocs-material
  dependency-version: 9.6.15
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements-docs.txt

@@ -1,4 +1,4 @@
 mkdocs==1.6.0
-mkdocs-material==9.5.31
+mkdocs-material==9.6.15
 mike==2.1.2
 mkdocs-macros-plugin==1.0.5