Upgrade to Jackson 2.9.6

Author: jhoeller

build.gradle

@@ -40,7 +40,7 @@ ext {
 	freemarkerVersion    = "2.3.27-incubating"
 	groovyVersion        = "2.4.15"
 	hsqldbVersion        = "2.4.1"
-	jackson2Version      = "2.9.5"
+	jackson2Version      = "2.9.6"
 	jettyVersion         = "9.4.11.v20180605"
 	junitJupiterVersion  = "5.0.3"
 	junitPlatformVersion = "1.0.3"