[GH-Actions][pages] Update mkdocs-material to 7.3.0

.github/workflows/gh-pages.yml

@@ -14,7 +14,7 @@ jobs:
         run: |
           sudo apt-get -y update
           sudo apt-get -y install python3-pip
-          pip install mkdocs-material==7.2.8 pygments==2.10.0 mkdocs-redirects==1.0.3
+          pip install mkdocs-material==7.3.0 pygments==2.10.0 mkdocs-redirects==1.0.3
 
       - name: Build site 🔧
         run: |

README.md

@@ -9,6 +9,6 @@ https://mailcow.github.io/mailcow-dockerized-docs
 To build it locally, you need the [Material theme for MkDocs](https://squidfunk.github.io/mkdocs-material/), [MkDocs](https://www.mkdocs.org/) itself and [Pygments](http://pygments.org/). To install these with [pip](https://pip.pypa.io/en/stable/) and get it up and running, fire up your terminal and enter
 
 ```
-pip install mkdocs-material==7.2.8 pygments==2.10.0 mkdocs-redirects==1.0.3
+pip install mkdocs-material==7.3.0 pygments==2.10.0 mkdocs-redirects==1.0.3
 mkdocs serve
 ```