Bump mkdocs-material from 8.1.0 to 8.1.1 (#17)

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 8.1.0 to 8.1.1.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@8.1.0...8.1.1)

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

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

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

requirements.dev.txt

@@ -7,7 +7,7 @@ bumpversion
 codecov
 pytest-cov
 mkdocs == 1.2.3
-mkdocs-material == 8.1.0
+mkdocs-material == 8.1.1
 mkdocs-markdownextradata-plugin == 0.2.4
 mkdocs-mermaid2-plugin
 markdown-include