compatibility update of Dispatcher with EventDispatcherInterface from…

… Symfony7

src/Event/Dispatcher.php

@@ -38,31 +38,31 @@ public function dispatch(object $event, string $eventName = null): object
  /**
  * {@inheritdoc}
  */
- public function addListener(string $eventName, $listener, int $priority = 0)
+ public function addListener(string $eventName, callable $listener, int $priority = 0): void
  {
  throw new \Exception('Please use `Event::listen()`.');
  }
 
  /**
  * {@inheritdoc}
  */
- public function addSubscriber(EventSubscriberInterface $subscriber)
+ public function addSubscriber(EventSubscriberInterface $subscriber): void
  {
  throw new \Exception('Please use `Event::subscribe()`.');
  }
 
  /**
  * {@inheritdoc}
  */
- public function removeListener(string $eventName, $listener)
+ public function removeListener(string $eventName, callable $listener): void
  {
  throw new \Exception('Please use `Event::forget()`.');
  }
 
  /**
  * {@inheritdoc}
  */
- public function removeSubscriber(EventSubscriberInterface $subscriber)
+ public function removeSubscriber(EventSubscriberInterface $subscriber): void
  {
  throw new \Exception('Removing event subscribers is not supported');
  }