Bump mkdocs-material from 9.6.14 to 9.6.15 in the pip-dependencies group

Bumps the pip-dependencies group with 1 update: [mkdocs-material](https://github.com/squidfunk/mkdocs-material).


Updates `mkdocs-material` from 9.6.14 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@9.6.14...9.6.15)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 mkdocs==1.6.1
 mkdocs-git-revision-date-localized-plugin==1.4.7
-mkdocs-material==9.6.14
+mkdocs-material==9.6.15
 mkdocs-redirects==1.2.2
 markdown-include==0.8.1