Bump mkdocs-material from 9.5.14 to 9.5.15 (#2777)

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.5.14 to 9.5.15.
- [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/9.5.14...9.5.15)

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

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

requirements-docs.txt

@@ -1,5 +1,5 @@
 mkdocs==1.5.3
-mkdocs-material==9.5.14
+mkdocs-material==9.5.15
 pymdown-extensions==10.7.1
 mike==2.0.0
 mkdocs-git-revision-date-localized-plugin==1.2.4