Switch to released version of plexus-xml 4.0.0

Author: gnodet

pom.xml

@@ -55,7 +55,7 @@ limitations under the License.
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-xml</artifactId>
-      <version>4.0.0-SNAPSHOT</version>
+      <version>4.0.0</version>
       <optional>true</optional>
     </dependency>
     <dependency>