Fix: Implicitly marking parameter $container as nullable is deprecated in PHP 8.4.

Fixes deprecation where implicitly marking parameter $container as nullable is deprecated, the explicit nullable type must be used instead.

Author: daikazu

src/Router.php

@@ -27,7 +27,7 @@ class Router extends BaseRouter
     /**
      * {@inheritdoc}
      */
-    public function __construct(Dispatcher $events, Container $container = null)
+    public function __construct(Dispatcher $events, ?Container $container = null)
     {
         parent::__construct($events, $container);