⬆ Update mkdocs-material requirement from <9.0.0,>=8.1.4 to >=8.1.4,<10.0.0 (#5862)

⬆ Update mkdocs-material requirement

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/8.1.4...9.0.3)

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

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