[MSHARED-506] Upgrade plexus-archiver from 2.9.1 to 3.1.1

 o Using the new version which fixes an NPE issue.


git-svn-id: https://svn.apache.org/repos/asf/maven/shared/trunk@1738420 13f79535-47bb-0310-9956-ffa450edef68

Author: khmarbaise

pom.xml

@@ -84,11 +84,7 @@
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-archiver</artifactId>
-      <!--
-        ! Currently the version 2.9.1 is the only one which works.
-        ! Version 2.10... etc. will fail in unit test with NPE
-      -->
-      <version>2.9.1</version>
+      <version>3.1.1</version>
     </dependency>
     <!-- plexus-archiver needs this, or else maven-artifact will pull in a version from the pliocene era -->
     <dependency>