Issue #3366623: Fix getSubscribedEvents error after d10 update

src/EventSubscriber/AddHttpHeaders.php

@@ -65,7 +65,7 @@ class AddHttpHeaders implements EventSubscriberInterface {
   /**
    * {@inheritdoc}
    */
-  public static function getSubscribedEvents() {
+  public static function getSubscribedEvents(): array {
     $events[KernelEvents::RESPONSE][] = ['onResponse'];
     return $events;
   }