Use the correct ActiveMQ version

Author: veithen

modules/samples/transport/jms-sample/jmsService/pom.xml

@@ -42,7 +42,7 @@
                     <dependency>
                         <groupId>org.apache.activemq</groupId>
                         <artifactId>activemq-broker</artifactId>
-                        <version>5.18.2</version>
+                        <version>${activemq.version}</version>
                     </dependency>
                     <dependency>
                         <groupId>commons-io</groupId>