[DI] add #[Required] where applicable

Author: kbond

src/Symfony/Bundle/FrameworkBundle/Controller/AbstractController.php

@@ -42,6 +42,7 @@
 use Symfony\Component\Serializer\SerializerInterface;
 use Symfony\Component\WebLink\EventListener\AddLinkHeaderListener;
 use Symfony\Component\WebLink\GenericLinkProvider;
+use Symfony\Contracts\Service\Attribute\Required;
 use Symfony\Contracts\Service\ServiceSubscriberInterface;
 use Twig\Environment;
 
@@ -60,6 +61,7 @@ abstract class AbstractController implements ServiceSubscriberInterface
     /**
      * @required
      */
+    #[Required]
     public function setContainer(ContainerInterface $container): ?ContainerInterface
     {
         $previous = $this->container;

src/Symfony/Contracts/Service/ServiceSubscriberTrait.php

@@ -12,6 +12,7 @@
 namespace Symfony\Contracts\Service;
 
 use Psr\Container\ContainerInterface;
+use Symfony\Contracts\Service\Attribute\Required;
 use Symfony\Contracts\Service\Attribute\SubscribedService;
 
 /**
@@ -67,9 +68,7 @@ public static function getSubscribedServices(): array
         return $services;
     }
 
-    /**
-     * @required
-     */
+    #[Required]
     public function setContainer(ContainerInterface $container): ?ContainerInterface
     {
         $this->container = $container;