Upgrade to Groovy 2.5 beta 1

Includes latest dependency updates (Commons FileUpload 1.3.3, OkHttp 3.8.1, XStream 1.4.10)

Issue: SPR-15407

build.gradle

@@ -47,9 +47,9 @@ configure(allprojects) { project ->
 	ext.ehcache3Version        = "3.3.1"
 	ext.ejbApiVersion          = "3.2"
 	ext.elApiVersion           = "3.0.1-b04"
-	ext.fileuploadVersion      = "1.3.2"
+	ext.fileuploadVersion      = "1.3.3"
 	ext.freemarkerVersion      = "2.3.26-incubating"
-	ext.groovyVersion          = "2.4.11"
+	ext.groovyVersion          = "2.5.0-beta-1"
 	ext.gsonVersion            = "2.8.1"
 	ext.hamcrestVersion        = "1.3"
 	ext.hibernate5Version      = "5.2.10.Final"
@@ -78,7 +78,7 @@ configure(allprojects) { project ->
 	ext.log4jVersion           = '2.8.2'
 	ext.nettyVersion           = "4.1.12.Final"
 	ext.niomultipartVersion    = "1.1.0"
-	ext.okhttp3Version         = "3.8.0"
+	ext.okhttp3Version         = "3.8.1"
 	ext.poiVersion             = "3.16"
 	ext.protobufVersion        = "3.3.1"
 	ext.quartzVersion          = "2.3.0"
@@ -99,7 +99,7 @@ configure(allprojects) { project ->
 	ext.websocketVersion       = "1.1"
 	ext.woodstoxVersion        = "5.0.3"
 	ext.xmlunitVersion         = "2.3.0"
-	ext.xstreamVersion         = "1.4.9"
+	ext.xstreamVersion         = "1.4.10"
 
 	ext.gradleScriptDir = "${rootProject.projectDir}/gradle"