fix: change for event dispatcher interface to keep logic from MySQLReplicationFactory

[misaert]

It is useful to keep the same logic with EventDispatcherInterface in Event class because it is this interface for MySQLReplicationFactory class. It prevents this error for example:

Argument 3 passed to MySQLReplication\Event\Event::__construct() must be an instance of Symfony\Component\EventDispatcher\EventDispatcher, instance of Symfony\Component\HttpKernel\Debug\TraceableEventDispatcher given

[krowinski]

tx