Do not extend the new SF 4.3 ControllerEvent so we can make it final

src/Symfony/Component/HttpKernel/Event/FilterControllerArgumentsEvent.php

@@ -17,7 +17,7 @@ use Symfony\Component\HttpKernel\HttpKernelInterface;
 /**
  * @deprecated since Symfony 4.3, use ControllerArgumentsEvent instead
  */
-class FilterControllerArgumentsEvent extends ControllerEvent
+class FilterControllerArgumentsEvent extends FilterControllerEvent
 {
     private $arguments;