fix grails version

Author: graemerocher

build.gradle

@@ -18,7 +18,7 @@ ext.providedDeps = []
 
 ext.provided = { providedDeps << it }
 ext {
-    grailsVersion = '2.3.8.RELEASE'
+    grailsVersion = '2.3.8'
     isBuildSnapshot = grailsVersion.endsWith(".BUILD-SNAPSHOT")
     antTraxVersion = "1.7.1"
     antVersion = "1.8.4"