Temporary downgrade to XStream 1.4.7 until Animal Sniffer 1.14 is available

Animal Sniffer 1.11 fails against XStream 1.4.8 due to classes with 1.8 bytecode level.
Animal Sniffer 1.14 will finally include ASM 5.0.3 for proper 1.8 bytecode support.

build.gradle

@@ -57,7 +57,7 @@ configure(allprojects) { project ->
 	ext.tyrusVersion         = "1.3.5"  // constrained by WebLogic 12.1.3 support
 	ext.undertowVersion      = "1.1.2.Final"
 	ext.woodstoxVersion      = "4.4.1"
-	ext.xstreamVersion       = "1.4.8"
+	ext.xstreamVersion       = "1.4.7"
 
 	ext.gradleScriptDir = "${rootProject.projectDir}/gradle"