Update to laravel 7

vendor/symfony/event-dispatcher/EventSubscriberInterface.php

@@ -40,7 +40,10 @@ interface EventSubscriberInterface
      *  * ['eventName' => ['methodName', $priority]]
      *  * ['eventName' => [['methodName1', $priority], ['methodName2']]]
      *
-     * @return array The event names to listen to
+     * The code must not depend on runtime state as it will only be called at compile time.
+     * All logic depending on runtime state must be put into the individual methods handling the events.
+     *
+     * @return array<string, string|array{0: string, 1: int}|list<array{0: string, 1?: int}>>
      */
     public static function getSubscribedEvents();
 }