[6.x] Improve dark mode heading icon color (#13115)

Co-authored-by: Jason Varga <[email protected]>

Author: JayGeorge

resources/js/components/ui/Heading.vue

@@ -35,7 +35,7 @@ const classes = cva({
 })({ ...props });
 
 const iconClasses = cva({
-    base: 'text-gray-500 dark:text-gray-600',
+    base: 'text-gray-500 dark:text-gray-500',
     variants: {
         size: {
             base: 'size-4',