Upgrade to XStream 1.4.9

Issue: SPR-14084

Author: jhoeller

build.gradle

@@ -82,7 +82,7 @@ configure(allprojects) { project ->
 	ext.undertowVersion      = "1.3.19.Final"
 	ext.woodstoxVersion      = "5.0.1"
 	ext.xmlunitVersion       = "1.6"
-	ext.xstreamVersion       = "1.4.8"
+	ext.xstreamVersion       = "1.4.9"
 
 	ext.gradleScriptDir = "${rootProject.projectDir}/gradle"