Apply new rector rules regarding to PHP version to 8.4

src/Bundle/ChillActivityBundle/migrations/Version20210506094520.php

@@ -19,12 +19,14 @@ use Doctrine\Migrations\AbstractMigration;
  */
 final class Version20210506094520 extends AbstractMigration
 {
+    #[\Override]
     public function down(Schema $schema): void
     {
         $this->addSql('ALTER TABLE activitytype DROP CONSTRAINT FK_B38CD05112469DE2');
         $this->addSql('ALTER TABLE activitytype DROP category_id');
     }
 
+    #[\Override]
     public function getDescription(): string
     {
         return '';