Merge branch '6.0' into 6.1

* 6.0:
  [DependencyInjection] remove static cache from `ServiceSubscriberTrait`

Author: derrabus

Service/ServiceSubscriberTrait.php

@@ -31,12 +31,6 @@ trait ServiceSubscriberTrait
      */
     public static function getSubscribedServices(): array
     {
-        static $services;
-
-        if (null !== $services) {
-            return $services;
-        }
-
         $services = method_exists(get_parent_class(self::class) ?: '', __FUNCTION__) ? parent::getSubscribedServices() : [];
 
         foreach ((new \ReflectionClass(self::class))->getMethods() as $method) {