Bump mkdocs-material from 8.1.7 to 8.1.8 in /config (#24)

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 8.1.7 to 8.1.8.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@8.1.7...8.1.8)

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

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

config/requirements.txt

@@ -1,6 +1,6 @@
 mkdocs==1.2.3
 mkdocs-exclude==1.0.2
-mkdocs-material==8.1.7
+mkdocs-material==8.1.8
 mkdocs-minify-plugin==0.5.0
 #mkdocs-drawio-exporter
 mkdocs-git-revision-date-localized-plugin==0.11.1