Remove deprecated ListenerLowCardinalityTags.DELIVERY_TAG

Fixes: #2921

Author: ngocnhan-tran1996

spring-rabbit/src/main/java/org/springframework/amqp/rabbit/support/micrometer/RabbitListenerObservation.java

@@ -28,6 +28,7 @@
  * @author Gary Russell
  * @author Vincent Meunier
  * @author Artem Bilan
+ * @author Ngoc Nhan
  *
  * @since 3.0
  */
@@ -84,24 +85,6 @@ public String asString() {
 				return "messaging.destination.name";
 			}
 
-		},
-
-		/**
-		 * The delivery tag.
-		 * After deprecation this key is not exposed as a low cardinality tag.
-		 *
-		 * @since 3.2
-		 *
-		 * @deprecated in favor of {@link ListenerHighCardinalityTags#DELIVERY_TAG}
-		 */
-		@Deprecated(since = "3.2.1", forRemoval = true)
-		DELIVERY_TAG {
-
-			@Override
-			public String asString() {
-				return "messaging.rabbitmq.message.delivery_tag";
-			}
-
 		}
 
 	}