fix the return type of the EntityWorkflowCreation constraint

src/Bundle/ChillMainBundle/Workflow/Validator/EntityWorkflowCreation.php

@@ -27,6 +27,9 @@ class EntityWorkflowCreation extends \Symfony\Component\Validator\Constraint
 
     public string $messageWorkflowNotAvailable = 'Workflow is not valid';
 
+    /**
+     * @return array<string>
+     */
     public function getTargets(): array
     {
         return [self::CLASS_CONSTRAINT];