Bump mkdocs-material from 7.0.3 to 7.0.6

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 7.0.3 to 7.0.6.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/docs/changelog.md)
- [Commits](squidfunk/mkdocs-material@7.0.3...7.0.6)

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

requirements-test.txt

@@ -5,7 +5,7 @@ flake8==3.8.4
 isort==5.7.0
 mike==0.5.5
 markdown-include==0.6.0
-mkdocs-material==7.0.3
+mkdocs-material==7.0.6
 mkdocs-minify-plugin==0.4.0
 mkdocstrings==0.14.0
 mypy==0.812