Upgrade to Tomcat 8.5.45, Netty 4.1.39, SLF4J 1.7.28

Author: jhoeller

build.gradle

@@ -47,14 +47,14 @@ ext {
 	junitVintageVersion  = "4.12.3"
 	kotlinVersion        = "1.2.71"
 	log4jVersion         = "2.11.2"
-	nettyVersion         = "4.1.38.Final"
+	nettyVersion         = "4.1.39.Final"
 	reactorVersion       = "Bismuth-SR17"
 	rxjavaVersion        = "1.3.8"
 	rxjavaAdapterVersion = "1.2.1"
 	rxjava2Version       = "2.1.17"
-	slf4jVersion         = "1.7.26"	  // spring-jcl + consistent 3rd party deps
+	slf4jVersion         = "1.7.28"	  // spring-jcl + consistent 3rd party deps
 	tiles3Version        = "3.0.8"
-	tomcatVersion        = "8.5.43"
+	tomcatVersion        = "8.5.45"
 	undertowVersion      = "1.4.27.Final"
 
 	gradleScriptDir = "${rootProject.projectDir}/gradle"