Drupal 11 compatibility

This is an automated pull request for Drupal 11 readiness using automated update script to keep Drupal contrib modules up-to-date with latest stable version of Drupal.

src/EventSubscriber/XframeSubscriber.php

@@ -56,7 +56,7 @@ class XframeSubscriber implements EventSubscriberInterface {
   /**
    * {@inheritdoc}
    */
-  public static function getSubscribedEvents() {
+  public static function getSubscribedEvents(): array {
     // Adds the event in the list of KernelEvents::RESPONSE with priority -20.
     $events[KernelEvents::RESPONSE][] = ['onKernelResponse', -20];
     return $events;