upgrade netty

Signed-off-by: Eugen Freiter <freiter@gmx.de>

Author: Eugen Freiter

pom.xml

@@ -11,7 +11,7 @@
 
 	<properties>
     	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<netty.version>4.1.42.Final</netty.version>
+		<netty.version>4.1.72.Final</netty.version>
 	</properties>
 
 	<licenses>