Update ApiVersioning to report v10

this change was accidentally omitted in #8708

Author: fm3

util/src/main/scala/com/scalableminds/util/mvc/ApiVersioning.scala

@@ -5,7 +5,7 @@ import play.api.mvc.RequestHeader
 
 trait ApiVersioning {
 
-  private lazy val CURRENT_API_VERSION: Int = 9
+  private lazy val CURRENT_API_VERSION: Int = 10
   private lazy val OLDEST_SUPPORTED_API_VERSION: Int = 5
 
   protected lazy val apiVersioningInfo: JsObject =