Merge branch '5.4' into 6.4

* 5.4:
  Do not produce notice/warning when consuming from multiple transports and explicitly listed queues
  [FrameworkBundle] Check if the _route attribute exists on the request
  [HttpClient] Make retry strategy work again
  [Mailer] Fix signed emails breaking the profiler
  [Validator] Update Spanish (es) translations
  Fix SQS visibility_timeout type

Transport/Connection.php

@@ -510,7 +510,7 @@ public function channel(): \AMQPChannel
     public function queue(string $queueName): \AMQPQueue
     {
         if (!isset($this->amqpQueues[$queueName])) {
-            $queueConfig = $this->queuesOptions[$queueName];
+            $queueConfig = $this->queuesOptions[$queueName] ?? [];
 
             $amqpQueue = $this->amqpFactory->createQueue($this->channel());
             $amqpQueue->setName($queueName);