Merge pull request 'Update dependency MarkupSafe to v2.1.3' (#3) from renovate/markupsafe-2.x into main

Reviewed-on: https://git.nick-slowinski.de/nick-slowinski.de/docs/pulls/3

requirements.txt

@@ -9,7 +9,7 @@ GitPython==3.1.31
 idna==3.4
 Jinja2==3.1.2
 Markdown==3.3.7
-MarkupSafe==2.1.2
+MarkupSafe==2.1.3
 mergedeep==1.3.4
 mkdocs==1.4.2
 mkdocs-git-revision-date-localized-plugin==1.1.0