[KARAF-2337] Upgrade to Apache POM 13

git-svn-id: https://svn.apache.org/repos/asf/karaf/webconsole/trunk@1485381 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 73312ba..7e217c4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <groupId>org.apache</groupId>
         <artifactId>apache</artifactId>
-        <version>12</version>
+        <version>13</version>
         <relativePath />
     </parent>