Start version 6.4

* Move `whats-new` to `changes-6.2-6.3.adoc`
* Upgrade dependency to the latest (including Gradle)
* Move Spring dependencies to based on SF-6.2
* Fix some deprecations and incompatibility

spring-integration-jms/src/main/java/org/springframework/integration/jms/JmsOutboundGateway.java

@@ -1367,11 +1367,15 @@ public class JmsOutboundGateway extends AbstractReplyProducingMessageHandler
 			if (isSubscriptionDurable() && !isPubSubDomain()) {
 				throw new IllegalArgumentException("A durable subscription requires a topic (pub-sub domain)");
 			}
-			synchronized (this.lifecycleMonitor) {
+			this.lifecycleLock.lock();
+			try {
 				if (isSubscriptionDurable() && this.getConcurrentConsumers() != 1) {
 					throw new IllegalArgumentException("Only 1 concurrent consumer supported for durable subscription");
 				}
 			}
+			finally {
+				this.lifecycleLock.unlock();
+			}
 		}
 
 		public Destination getReplyDestination() {