[ATTIC-222] retire Submarine

git-svn-id: https://svn.apache.org/repos/asf/attic/site@1917829 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/xdocs/tracking.xml b/xdocs/tracking.xml
index c3c54a0..53bc4dc 100644
--- a/xdocs/tracking.xml
+++ b/xdocs/tracking.xml
@@ -45,6 +45,7 @@
     <tr><th>Retirement month</th><th>Completed</th><th>Project</th><th>Tracking</th></tr>
     <tr><td>2024-01</td><td>2024-05</td><td>Apache Bahir</td><td><a href="https://issues.apache.org/jira/browse/ATTIC-220">ATTIC-220</a></td></tr>
     <tr><td>2024-02</td><td>2024-05</td><td>Apache Archiva</td><td><a href="https://issues.apache.org/jira/browse/ATTIC-221">ATTIC-221</a></td></tr>
+    <tr><td>2024-05</td><td></td><td>Apache Submarine</td><td><a href="https://issues.apache.org/jira/browse/ATTIC-222">ATTIC-222</a></td></tr>
   </table></p>
 </section>