Update application version to latest version from networkservicemesh/…

…cmd-nse-icmp-responder-vpp@master networkservicemesh/cmd-nse-icmp-responder-vpp#

networkservicemesh/cmd-nse-icmp-responder-vpp PR link: https://github.com/networkservicemesh/cmd-nse-icmp-responder-vpp/pull/

networkservicemesh/cmd-nse-icmp-responder-vpp commit message:
commit 52f9172306f8253cea99c80b94bdc7d19ed3743d
Author: Network Service Mesh Bot <60070799+nsmbot@users.noreply.github.com>
Date:   Sat Apr 17 15:09:04 2021 -0500

    Update go.mod and go.sum to latest version from networkservicemesh/sd…

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

apps/nse-memif/nse.yaml

@@ -16,7 +16,7 @@ spec:
     spec:
       containers:
         - name: nse
-          image: networkservicemeshci/cmd-nse-icmp-responder-vpp:21d277d0
+          image: networkservicemeshci/cmd-nse-icmp-responder-vpp:52f91723
           imagePullPolicy: IfNotPresent
           env:
             - name: SPIFFE_ENDPOINT_SOCKET