upgrade plexus-utils version

git-svn-id: https://svn.apache.org/repos/asf/archiva/redback/redback-components/trunk@1544408 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 5bcfd6a..5a99bd6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -173,6 +173,11 @@
         <artifactId>plexus-container-default</artifactId>
         <version>1.0-alpha-20</version>
       </dependency>
+      <dependency>
+        <groupId>org.codehaus.plexus</groupId>
+        <artifactId>plexus-utils</artifactId>
+        <version>3.0.15</version>
+      </dependency>
     </dependencies>
   </dependencyManagement>
   <dependencies>