Upgrade to Stylelint 15 with Prettier (#23558)

app/javascript/styles/mastodon/basics.scss

@@ -14,7 +14,7 @@ body {
   font-weight: 400;
   color: $primary-text-color;
   text-rendering: optimizelegibility;
-  font-feature-settings: "kern";
+  font-feature-settings: 'kern';
   text-size-adjust: none;
   -webkit-tap-highlight-color: rgba(0, 0, 0, 0%);
   -webkit-tap-highlight-color: transparent;
@@ -31,7 +31,9 @@ body {
     // Droid Sans => Older Androids (<4.0)
     // Helvetica Neue => Older macOS <10.11
     // $font-sans-serif => web-font (Roboto) fallback and newer Androids (>=4.0)
-    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", $font-sans-serif, sans-serif;
+    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
+      Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
+      $font-sans-serif, sans-serif;
   }
 
   &.app-body {