Delete setting priority field

because this commit is rebased onto branch amqp-durable
containing #13918

Author: ansd

deps/rabbit/test/amqp_jms_SUITE_data/src/test/java/com/rabbitmq/amqp/tests/jms/JmsTest.java

@@ -337,13 +337,6 @@ public void message_selector_header_fields(
   private void testJMSDeliveryMode(Session session, Queue queue) throws Exception {
       MessageProducer producer = session.createProducer(queue);
 
-      // For now we can only write a test where some AMQP header section field has a non-default value,
-      // e.g. priority is set to a value other than the default of 4.
-      // Only then will the Qpid JMS client send the durable field in the AMQP header section.
-      // Once https://issues.apache.org/jira/browse/QPIDJMS-608 is resolved, we can remove below line.
-      // TODO delete below line when https://github.com/rabbitmq/rabbitmq-server/pull/13918 is merged
-      producer.setPriority(3);
-
       // default is DeliveryMode.PERSISTENT
       TextMessage msg1 = session.createTextMessage("msg 1");
       producer.send(msg1);