update plexus archiver (#14)

diff --git a/maven-plugin-testing-harness/pom.xml b/maven-plugin-testing-harness/pom.xml
index b4a6284..8a708a7 100644
--- a/maven-plugin-testing-harness/pom.xml
+++ b/maven-plugin-testing-harness/pom.xml
@@ -68,7 +68,7 @@
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-archiver</artifactId>
-      <version>2.2</version>
+      <version>4.2.2</version>
     </dependency>
   </dependencies>