Update application version to latest version from networkservicemesh/…

…cmd-registry-k8s@master networkservicemesh/cmd-registry-k8s#33

networkservicemesh/cmd-registry-k8s PR link: networkservicemesh/cmd-registry-k8s#33

networkservicemesh/cmd-registry-k8s commit message:
commit ff506bb408ce6cd477b5d8356730815aaf471fbf
Author: Network Service Mesh Bot <60070799+nsmbot@users.noreply.github.com>
Date:   Thu Feb 18 11:19:50 2021 -0600

    Merge 0d6ce880d1bae3995b1b46594ff316283a8ba98c into 013aef13e46e5db4795c1bf9fb5a88ce6cd1df64

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:906febdb
+        - image: networkservicemeshci/cmd-registry-k8s:ff506bb4
           env:
             - name: SPIFFE_ENDPOINT_SOCKET
               value: unix:///run/spire/sockets/agent.sock