N°8017 - Security - dependabot - Symfony's VarDumper vulnerable to un… (#731)

Upgrade all Symfony components to last security fix (~6.4.0)

lib/symfony/event-dispatcher-contracts/EventDispatcherInterface.php

@@ -29,5 +29,5 @@ interface EventDispatcherInterface extends PsrEventDispatcherInterface
      *
      * @return T The passed $event MUST be returned
      */
-    public function dispatch(object $event, string $eventName = null): object;
+    public function dispatch(object $event, ?string $eventName = null): object;
 }