[MSTAGE-19] Upgrade maven-wagon to 2.8

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1651493 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index aa1b7e6..13dfd3e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -59,7 +59,7 @@
   </distributionManagement>
 
   <properties>
-    <wagonVersion>2.4</wagonVersion>
+    <wagonVersion>2.8</wagonVersion>
     <mavenVersion>2.2.1</mavenVersion>
   </properties>