LibJS: Remove unused header includes

Author: https://github.com/bgianfo
Commit: 53166c10ca
Pull-request: https://github.com/SerenityOS/serenity/pull/9120
Reviewed-by: https://github.com/AtkinsSJ ✅

Userland/Libraries/LibJS/Runtime/SymbolObject.cpp

@@ -4,12 +4,9 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include <LibJS/Heap/Heap.h>
 #include <LibJS/Runtime/GlobalObject.h>
 #include <LibJS/Runtime/Symbol.h>
 #include <LibJS/Runtime/SymbolObject.h>
-#include <LibJS/Runtime/SymbolPrototype.h>
-#include <LibJS/Runtime/Value.h>
 
 namespace JS {