Upgrade to Apache HttpClient 4.5.5 and Tomcat 8.5.27

Author: jhoeller

build.gradle

@@ -51,7 +51,7 @@ configure(allprojects) { project ->
 	ext.hibval5Version       = "5.2.5.Final"
 	ext.hsqldbVersion        = "2.3.4"
 	ext.httpasyncVersion     = "4.1.3"
-	ext.httpclientVersion    = "4.5.3"
+	ext.httpclientVersion    = "4.5.5"
 	ext.jackson2Version      = "2.8.11"
 	ext.jasperreportsVersion = "6.2.1"  // our tests fail with JR-internal NPEs against 6.2.2 and higher
 	ext.javamailVersion      = "1.5.6"
@@ -75,7 +75,7 @@ configure(allprojects) { project ->
 	ext.testngVersion        = "6.9.10"
 	ext.tiles2Version        = "2.2.2"
 	ext.tiles3Version        = "3.0.7"
-	ext.tomcatVersion        = "8.5.24"
+	ext.tomcatVersion        = "8.5.27"
 	ext.tyrusVersion         = "1.3.5"  // constrained by WebLogic 12.1.3 support
 	ext.undertowVersion      = "1.3.33.Final"
 	ext.xmlunitVersion       = "1.6"