Update Netty to 4.1.30.Final

build.gradle

@@ -14,7 +14,7 @@ allprojects {
         junitVersion = '5.3.0-M1'
         slf4jVersion = '1.7.25'
         log4jVersion = '2.11.1'
-        nettyVersion = '4.1.29.Final'
+        nettyVersion = '4.1.30.Final'
         guavaVersion = '25.1-jre'
 
         getCurrentBranchName = {