⬆ Update mkdocs-material requirement from 9.1.21 to 9.2.7 (#675)

⬆ Update mkdocs-material requirement from 9.1.21 to 9.2.7 (#675)

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](https://github.com/squidfunk/mkdocs-material/compare/9.1.21...9.2.7)

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

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