Remove no longer used annotation use statements and replace with attribute use statements

src/Bundle/ChillMainBundle/Entity/ExportGeneration.php

@@ -17,7 +17,7 @@ use Chill\MainBundle\Doctrine\Model\TrackCreationTrait;
 use Doctrine\ORM\Mapping as ORM;
 use Ramsey\Uuid\Uuid;
 use Ramsey\Uuid\UuidInterface;
-use Symfony\Component\Serializer\Annotation as Serializer;
+use Symfony\Component\Serializer\Attribute as Serializer;
 
 /**
  * Contains the single execution of an export.