Appoint XueFeng Liu as Senlin PTL

XueFeng Liu sent their late candidacy
for Senlin PTL position of Xena Cycle
- https://review.opendev.org/c/openstack/election/+/779656

Change-Id: Ie127f0d7aa9765a234a3596376bb0de9504f28ea

reference/projects.yaml

@@ -2802,11 +2802,12 @@ sahara:
       - mugsie
 senlin:
   ptl:
-    name: APPOINTMENT NEEDED
+    name: XueFeng Liu
     irc: No nick supplied
-    email: example@example.org
+    email: liu.xuefeng1@zte.com.cn
   appointed:
     - wallaby
+    - xena
   irc-channel: senlin
   service: Clustering service
   mission: >