chore(deps): bump the pip group across 1 directory with 2 updates

Updates the requirements on [mkdocs](https://github.com/mkdocs/mkdocs) and [mkdocs-material](https://github.com/squidfunk/mkdocs-material) to permit the latest version.

Updates `mkdocs` to 1.6.1
- [Release notes](https://github.com/mkdocs/mkdocs/releases)
- [Commits](mkdocs/mkdocs@1.6.0...1.6.1)

Updates `mkdocs-material` to 9.7.6
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.5.0...9.7.6)

---
updated-dependencies:
- dependency-name: mkdocs
  dependency-version: 1.6.1
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: mkdocs-material
  dependency-version: 9.7.6
  dependency-type: direct:production
  dependency-group: pip
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,4 +1,4 @@
 # MkDocs Material documentation dependencies
-mkdocs>=1.6,<2
-mkdocs-material>=9.5.0
+mkdocs>=1.6.1,<2
+mkdocs-material>=9.7.6
 mkdocs-minify-plugin>=0.8.0