Bump Java client to 5.3.0

Fixes #100

Author: acogoluegnes

pom.xml

@@ -54,7 +54,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
-    <rabbitmq.version>5.2.0</rabbitmq.version>
+    <rabbitmq.version>5.3.0</rabbitmq.version>
     <commons-cli.version>1.1</commons-cli.version>
     <metrics.version>4.0.2</metrics.version>
     <micrometer.version>1.0.4</micrometer.version>