Update pom with new repository for jbossws-native/3.1.2.GA

As per the comment by Paul Gier on JBBUILD-682...

"If you find that projects/archetypes have a dependency on this repository URL, please file a jira with that project to fix their poms to point to the new repository URLs described in the wiki."

...we are unable to reference JBoss WS 3.2.1.GA (for JBoss 5.1) via Maven as the POM points to the old repository.

https://repository.jboss.org/nexus/content/groups/public-jboss/org/jboss/ws/native/jbossws-native/3.1.2.GA/

Thank you
Richard