Update application version to latest version from networkservicemesh/…

…cmd-registry-k8s@master networkservicemesh/cmd-registry-k8s#50

networkservicemesh/cmd-registry-k8s PR link: networkservicemesh/cmd-registry-k8s#50

networkservicemesh/cmd-registry-k8s commit message:
commit ff6d37ed3ac5bb29af50c148b5caf39aa736a068
Author: Network Service Mesh Bot <60070799+nsmbot@users.noreply.github.com>
Date:   Fri Mar 5 11:26:35 2021 -0600

    Merge 1d1134720e080380e0e521720ce3bcbb518c4ed5 into d372b4ecc629ab3fdc59ea0213fe1368bbb54ff5

Signed-off-by: NSMBot <nsmbot@networkservicmesh.io>

apps/registry-k8s/registry-k8s.yaml

@@ -16,7 +16,7 @@ spec:
     spec:
       serviceAccountName: registry-k8s-sa
       containers:
-        - image: networkservicemeshci/cmd-registry-k8s:f56d824d
+        - image: networkservicemeshci/cmd-registry-k8s:ff6d37ed
           env:
             - name: SPIFFE_ENDPOINT_SOCKET
               value: unix:///run/spire/sockets/agent.sock