Update mkdocs-material from 6.2.8 to 9.4.0

requirements/requirements-docs.txt

@@ -30,7 +30,7 @@ mkdocs==1.4.3
     #   mkdocs-material
 mkdocs-asf-theme==0.2.4
     # via -r requirements/requirements-docs.in
-mkdocs-material==6.2.8
+mkdocs-material==9.4.0
     # via mkdocs-asf-theme
 mkdocs-material-extensions==1.1.1
     # via mkdocs-material