Update mkdocs-minify-plugin requirement from <0.8 to <0.9

Updates the requirements on [mkdocs-minify-plugin](https://github.com/byrnereese/mkdocs-minify-plugin) to permit the latest version.
- [Release notes](https://github.com/byrnereese/mkdocs-minify-plugin/releases)
- [Commits](byrnereese/mkdocs-minify-plugin@0.1.0...0.8.0)

---
updated-dependencies:
- dependency-name: mkdocs-minify-plugin
  dependency-type: direct:production
...

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

requirements.txt

@@ -9,7 +9,7 @@ pre-commit>=3,<4
 
 # Project requirements
 # -----------------------
-mkdocs-minify-plugin<0.8
+mkdocs-minify-plugin<0.9
 mkdocs-git-revision-date-localized-plugin>=1,<2
 
 CairoSVG>=2.5,<3