build(deps): bump mkdocs-awesome-pages-plugin from 2.8.0 to 2.9.0

Bumps [mkdocs-awesome-pages-plugin](https://github.com/lukasgeiter/mkdocs-awesome-pages-plugin) from 2.8.0 to 2.9.0.
- [Release notes](https://github.com/lukasgeiter/mkdocs-awesome-pages-plugin/releases)
- [Commits](https://github.com/lukasgeiter/mkdocs-awesome-pages-plugin/compare/v2.8.0...v2.9.0)

---
updated-dependencies:
- dependency-name: mkdocs-awesome-pages-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

docs/requirements.txt

@@ -1,5 +1,5 @@
 mkdocs-glightbox==0.3.2
-mkdocs-awesome-pages-plugin==2.8.0
+mkdocs-awesome-pages-plugin==2.9.0
 mkdocs-git-revision-date-localized-plugin==1.2.0
 mkdocs-macros-plugin==0.7.0
 mkdocs-material==9.1.6