DX: apply rector rules up to php8.0

src/Bundle/ChillActivityBundle/Entity/ActivityReasonCategory.php

@@ -21,7 +21,7 @@ use Doctrine\ORM\Mapping as ORM;
  * @ORM\Table(name="activityreasoncategory")
  * @ORM\HasLifecycleCallbacks
  */
-class ActivityReasonCategory
+class ActivityReasonCategory implements \Stringable
 {
     /**
      * @var bool
@@ -65,7 +65,7 @@ class ActivityReasonCategory
     /**
      * @return string
      */
-    public function __toString()
+    public function __toString(): string
     {
         return 'ActivityReasonCategory(' . $this->getName('x') . ')';
     }