Issue #3465213 by jonathan1055: Add 'array' return type in getSubscribedEvents()

tests/modules/scheduler_api_test/src/EventSubscriber.php

@@ -27,7 +27,7 @@ class EventSubscriber implements EventSubscriberInterface {
   /**
    * {@inheritdoc}
    */
-  public static function getSubscribedEvents() {
+  public static function getSubscribedEvents(): array {
     // Initialize the array to avoid 'variable is undefined' phpcs error.
     $events = [];