Bump to Netty 4.1.56.Final

build.gradle

@@ -26,7 +26,7 @@ allprojects {
         junitVersion = '5.7.0'
         slf4jVersion = '1.7.30'
         log4jVersion = '2.13.3'
-        nettyVersion = '4.1.55.Final'
+        nettyVersion = '4.1.56.Final'
         guavaVersion = '25.1-jre'
         checkerFrameworkVersion = '3.6.1'
         configurateVersion = '3.7.1'