[MWAR-347] Upgrade plexus-io to 2.6

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1682791 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index b800ba7..8633103 100644
--- a/pom.xml
+++ b/pom.xml
@@ -118,7 +118,7 @@
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-io</artifactId>
-      <version>2.4.1</version>
+      <version>2.6</version>
     </dependency>
     <dependency>
       <groupId>commons-io</groupId>