[TOOLS] Continue raising PHPStan level to 6

components/Language/Entity/ActorLanguage.php

@@ -119,6 +119,9 @@ class ActorLanguage extends Entity
         ) ?: [Language::getByLocale(Common::config('site', 'language'))];
     }
 
+    /**
+     * @return int[]
+     */
     public static function getActorRelatedLanguagesIds(Actor $actor): array
     {
         return Cache::getList(