LibJS: Convert Heap::allocate{,_without_realm}() to NonnullGCPtr

Author: https://github.com/linusg
Commit: 22089436ed
Pull-request: https://github.com/SerenityOS/serenity/pull/16498
Reviewed-by: https://github.com/trflynn89 ✅

Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.cpp

@@ -17,7 +17,7 @@ JS::NonnullGCPtr<IntersectionObserver> IntersectionObserver::construct_impl(JS::
     (void)callback;
     (void)options;
 
-    return *realm.heap().allocate<IntersectionObserver>(realm, realm);
+    return realm.heap().allocate<IntersectionObserver>(realm, realm);
 }
 
 IntersectionObserver::IntersectionObserver(JS::Realm& realm)