Bump mkdocs-minify-plugin from 0.3.0 to 0.4.0

Bumps [mkdocs-minify-plugin](https://github.com/byrnereese/mkdocs-minify-plugin) from 0.3.0 to 0.4.0.
- [Release notes](https://github.com/byrnereese/mkdocs-minify-plugin/releases)
- [Commits](byrnereese/mkdocs-minify-plugin@0.3.0...0.4.0)

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

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 mkdocs==1.1.2
 mkdocs-material==5.5.13
-mkdocs-minify-plugin==0.3.0
+mkdocs-minify-plugin==0.4.0
 pymdown-extensions==8.0
 mkdocs-bibtex==0.3.0