Upgrade to Netty 4.1.20 and Tomcat 8.5.24

Author: jhoeller

build.gradle

@@ -62,7 +62,7 @@ configure(allprojects) { project ->
 	ext.jtaVersion           = "1.2"
 	ext.junitVersion         = "4.12"
 	ext.log4jVersion         = "1.2.17"
-	ext.nettyVersion         = "4.1.17.Final"
+	ext.nettyVersion         = "4.1.20.Final"
 	ext.okhttpVersion        = "2.7.5"
 	ext.okhttp3Version       = "3.8.1"
 	ext.openjpaVersion       = "2.4.2"
@@ -75,7 +75,7 @@ configure(allprojects) { project ->
 	ext.testngVersion        = "6.9.10"
 	ext.tiles2Version        = "2.2.2"
 	ext.tiles3Version        = "3.0.7"
-	ext.tomcatVersion        = "8.5.23"
+	ext.tomcatVersion        = "8.5.24"
 	ext.tyrusVersion         = "1.3.5"  // constrained by WebLogic 12.1.3 support
 	ext.undertowVersion      = "1.3.33.Final"
 	ext.xmlunitVersion       = "1.6"