Fix JmsClient visibility

See gh-32501

Author: jhoeller

spring-jms/src/main/java/org/springframework/jms/core/JmsClient.java

@@ -78,7 +78,7 @@
  * @see JmsMessagingTemplate
  * @see org.springframework.messaging.support.MessageBuilder
  */
-interface JmsClient {
+public interface JmsClient {
 
 	/**
 	 * Provide an operation handle for the given JMS destination.