Bump mkdocs-material from 6.2.6 to 7.0.4 (#481)

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 6.2.6 to 7.0.4.
- [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@6.2.6...7.0.4)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Dan Schaper <dan.schaper@pi-hole.net>

requirements.txt

@@ -1,5 +1,5 @@
 markdown-include==0.6.0
 mkdocs==1.1.2
 mkdocs-git-revision-date-localized-plugin==0.8
-mkdocs-material==6.2.6
+mkdocs-material==7.0.4
 mkdocs-redirects==1.0.1