Add back missing uses

Author: sroze

Tests/Transport/AmqpExt/Fixtures/long_receiver.php

@@ -12,10 +12,13 @@
 
 require_once $autoload;
 
+use Symfony\Component\Messenger\Envelope;
+use Symfony\Component\Messenger\MessageBusInterface;
 use Symfony\Component\Messenger\Retry\MultiplierRetryStrategy;
 use Symfony\Component\Messenger\Transport\AmqpExt\AmqpReceiver;
 use Symfony\Component\Messenger\Transport\AmqpExt\Connection;
 use Symfony\Component\Messenger\Transport\Serialization\Serializer;
+use Symfony\Component\Messenger\Worker;
 use Symfony\Component\Serializer as SerializerComponent;
 use Symfony\Component\Serializer\Encoder\JsonEncoder;
 use Symfony\Component\Serializer\Normalizer\ArrayDenormalizer;