Make Security dependency readonly in SavedExportType

Marking the Security property as readonly ensures it cannot be reassigned after initialization. This enforces immutability, improving code safety and clarity.

src/Bundle/ChillMainBundle/Form/SavedExportType.php

@@ -23,7 +23,7 @@ use Symfony\Component\Security\Core\Security;
 
 class SavedExportType extends AbstractType
 {
-    public function __construct(private Security $security) {}
+    public function __construct(private readonly Security $security) {}
 
     public function buildForm(FormBuilderInterface $builder, array $options)
     {