Update mkdocs-material requirement from ~=9.6.2 to ~=9.6.7

Updates the requirements on [mkdocs-material](https://github.com/squidfunk/mkdocs-material) to permit the latest version.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.6.2...9.6.7)

---
updated-dependencies:
- dependency-name: mkdocs-material
  dependency-type: direct:development
...

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

dev-requirements.txt

@@ -1,6 +1,6 @@
 mkdocs~=1.6.1
 mkdocs-include-markdown-plugin~=7.1.2
-mkdocs-material~=9.6.2
+mkdocs-material~=9.6.7
 mkdocs-table-reader-plugin~=3.1.0
 
 pytest~=8.3.4