Bump mkdocs-material from 7.1.8 to 7.2.6 (#1835)

Bump mkdocs-material from 7.1.8 to 7.2.6 (#1835)

* Bump mkdocs-material from 7.1.8 to 7.2.6

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 7.1.8 to 7.2.6.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/docs/changelog.md)
- [Commits](https://github.com/squidfunk/mkdocs-material/compare/7.1.8...7.2.6)

---
updated-dependencies:
- dependency-name: mkdocs-material
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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* Update requirements.txt

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Co-authored-by: Tom Christie <tom@tomchristie.com>