Upgrade to Tomcat 8.0.28

Author: jhoeller

build.gradle

@@ -52,7 +52,7 @@ configure(allprojects) { project ->
 	ext.snifferVersion       = "1.11"
 	ext.tiles2Version        = "2.2.2"
 	ext.tiles3Version        = "3.0.5"
-	ext.tomcatVersion        = "8.0.27"
+	ext.tomcatVersion        = "8.0.28"
 	ext.tyrusVersion         = "1.3.5"  // constrained by WebLogic 12.1.3 support
 	ext.undertowVersion      = "1.1.8.Final"
 	ext.woodstoxVersion      = "4.4.1"