Update to netty 4.1.67.Final (#319)

Motivation:

We should use the latest netty release

Modifications:

Update to 4.1.67.Final

Result:

Use latest netty release

Author: normanmaurer

pom.xml

@@ -71,7 +71,7 @@
     <nativeLibOnlyDir>${project.build.directory}/native-lib-only</nativeLibOnlyDir>
     <skipTests>false</skipTests>
     <packaging.type>jar</packaging.type>
-    <netty.version>4.1.66.Final</netty.version>
+    <netty.version>4.1.67.Final</netty.version>
     <netty.build.version>29</netty.build.version>
     <junit.version>5.7.0</junit.version>
     <jni.classifier>${os.detected.name}-${os.detected.arch}</jni.classifier>