chore: upgrade to Symfony 6.4

src/Form/DataTransformer/FeedbackToRatingsTransformer.php

@@ -11,13 +11,13 @@ class FeedbackToRatingsTransformer implements DataTransformerInterface
     {
     }
 
-    public function transform(mixed $value)
+    public function transform(mixed $value): mixed
     {
         // Not in use
         return $value;
     }
 
-    public function reverseTransform(mixed $value)
+    public function reverseTransform(mixed $value): mixed
     {
         $feedbackRatings = [];