use a staged released parent

git-svn-id: https://svn.apache.org/repos/asf/archiva/branches/2.0.1-RC@1576565 13f79535-47bb-0310-9956-ffa450edef68

pom.xml

@@ -26,7 +26,7 @@
   <parent>
     <groupId>org.apache.archiva</groupId>
     <artifactId>archiva-parent</artifactId>
-    <version>12-SNAPSHOT</version>
+    <version>12</version>
     <relativePath />
   </parent>