LibWeb: Make CSSRule and all its subclasses GC-allocated

Author: https://github.com/awesomekling
Commit: 12042f0757
Pull-request: https://github.com/SerenityOS/serenity/pull/14816
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWeb/CSS/CSSImportRule.idl

@@ -2,7 +2,7 @@
 #import <CSS/CSSStyleSheet.idl>
 #import <CSS/MediaList.idl>
 
-[Exposed=Window]
+[Exposed=Window, NoInstanceWrapper]
 interface CSSImportRule : CSSRule {
     readonly attribute USVString href;
     // [SameObject, PutForwards=mediaText] readonly attribute MediaList media;