keepalived: Update container image tag

The _dev_ tag has gone away, but this image has CI now, so a _latest_
tag is available instead.

keepalived/keepalived.yaml

@@ -18,7 +18,7 @@ spec:
         command:
         - sh
         - -c
-        - |
+        - | # bash
           printf '$INTERFACE=%s\n' \
             $(ip route | awk '/^default via/{print $5}') \
             > /run/keepalived.interface
@@ -28,7 +28,7 @@ spec:
           subPath: run
       containers:
       - name: keepalived
-        image: git.pyrocufflink.net/containerimages/keepalived:dev
+        image: git.pyrocufflink.net/containerimages/keepalived
         imagePullPolicy: Always
         command:
         - keepalived