LibWeb: Port EventLoop::spin_XXX to HeapFunction

Author: https://github.com/shannonbooth
Commit: 1c18b900e2
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2062
Reviewed-by: https://github.com/kalenikaliaksandr ✅

Userland/Libraries/LibWeb/HTML/HTMLScriptElement.cpp

@@ -86,7 +86,7 @@ void HTMLScriptElement::execute_script()
     // https://html.spec.whatwg.org/multipage/document-lifecycle.html#read-html
     // Before any script execution occurs, the user agent must wait for scripts may run for the newly-created document to be true for document.
     if (!m_document->ready_to_run_scripts())
-        main_thread_event_loop().spin_until([&] { return m_document->ready_to_run_scripts(); });
+        main_thread_event_loop().spin_until(JS::create_heap_function(heap(), [&] { return m_document->ready_to_run_scripts(); }));
 
     // 1. Let document be el's node document.
     JS::NonnullGCPtr<DOM::Document> document = this->document();