chore(mkdocs.yaml): bump the fontawesome version (#716)

Signed-off-by: Mete Fatih Cırıt <mfc@autoware.org>

Author: xmfcx

mkdocs.yaml

@@ -46,7 +46,7 @@ extra:
 
 extra_css:
   - assets/css/extra.css
-  - https://use.fontawesome.com/releases/v5.15.4/css/all.css
+  - https://use.fontawesome.com/releases/v7.1.0/css/all.css
 
 extra_javascript:
   - assets/js/mathjax.js