theme/flatcar: force a new CSS filename

This is currently causing cache issue.

Signed-off-by: Mathieu Tortuyaux <[email protected]>

Author: tormath1

themes/flatcar/layouts/partials/head.html

@@ -80,7 +80,7 @@
     <meta name="twitter:creator" content="@flatcar" />
     <meta name="twitter:site" content="@flatcar" />
 
-    <link rel="stylesheet" href="/css/font-awesome.min.css">
+    <link rel="stylesheet" href="/css/font-awesome-6-5-2.min.css">
 
     <!-- Custom CSS -->
     {{ $options := (dict "targetPath" "/css/style.css" "outputStyle" "compressed" "enableSourceMap" true) }}