LibJS: Convert StringObject::create() to NonnullGCPtr

Author: https://github.com/linusg
Commit: 049e99b5f0
Pull-request: https://github.com/SerenityOS/serenity/pull/16479
Reviewed-by: https://github.com/davidot ✅

Userland/Libraries/LibJS/Runtime/StringObject.h

@@ -14,7 +14,7 @@ class StringObject : public Object {
     JS_OBJECT(StringObject, Object);
 
 public:
-    static StringObject* create(Realm&, PrimitiveString&, Object& prototype);
+    static NonnullGCPtr<StringObject> create(Realm&, PrimitiveString&, Object& prototype);
 
     virtual void initialize(Realm&) override;
     virtual ~StringObject() override = default;