Apply new rector rules regarding to PHP version to 8.4

src/Bundle/ChillActivityBundle/migrations/Version20211119173555.php

@@ -16,11 +16,13 @@ use Doctrine\Migrations\AbstractMigration;
 
 final class Version20211119173555 extends AbstractMigration
 {
+    #[\Override]
     public function down(Schema $schema): void
     {
         $this->throwIrreversibleMigrationException();
     }
 
+    #[\Override]
     public function getDescription(): string
     {
         return 'remove comment on deprecated json_array type';