Automated Project Update Bot fixes

This merge request was automatically created by the Project Update Bot. It contains the changes from run 11-121090.

src/EventSubscriber/ConfigSubscriber.php

@@ -23,7 +23,7 @@ class ConfigSubscriber implements EventSubscriberInterface {
   /**
    * {@inheritdoc}
    */
-  public static function getSubscribedEvents() {
+  public static function getSubscribedEvents(): array {
     return [
       ConfigEvents::SAVE   => 'configAltered',
       ConfigEvents::DELETE => 'configAltered',