chore(deps-dev): update mkdocs-material requirement (#209)

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@9.6.21...9.7.6)

---
updated-dependencies:
- dependency-name: mkdocs-material
  dependency-version: 9.7.6
  dependency-type: direct:development
...

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Author: dependabot[bot]

pyproject.toml

@@ -122,7 +122,7 @@ dev = [
 ]
 docs = [
     "mkdocs>=1.6.1",
-    "mkdocs-material>=9.6.21",
+    "mkdocs-material>=9.7.6",
     "mkdocs-minify-plugin>=0.8.0",
     "pymdown-extensions>=10.16.1",
     "mike>=2.1.3",