Automated Project Update Bot fixes

Relates to #3520161. This merge request was automatically created by the Project Update Bot. It contains the changes from run 11-477325.

src/EventSubscriber/FirewallSubscriber.php

@@ -42,7 +42,7 @@ class FirewallSubscriber implements EventSubscriberInterface {
    * @return array
    *   An array of event listener definitions.
    */
-  public static function getSubscribedEvents() {
+  public static function getSubscribedEvents(): array {
     $events['kernel.request'] = ['loginFirewall'];
 
     return $events;