LibWeb: Make HTMLCollection and subclasses GC-allocated

Author: https://github.com/awesomekling
Commit: 2bba97964b
Pull-request: https://github.com/SerenityOS/serenity/pull/14816
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWeb/HTML/HTMLTableSectionElement.h

@@ -17,7 +17,7 @@ class HTMLTableSectionElement final : public HTMLElement {
 public:
     virtual ~HTMLTableSectionElement() override;
 
-    NonnullRefPtr<DOM::HTMLCollection> rows() const;
+    JS::NonnullGCPtr<DOM::HTMLCollection> rows() const;
     DOM::ExceptionOr<JS::NonnullGCPtr<HTMLTableRowElement>> insert_row(long index);
     DOM::ExceptionOr<void> delete_row(long index);