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 4de1efd6b46cd132e5c99ffd464a62ff5aed518b
Author: Network Service Mesh Bot <60070799+nsmbot@users.noreply.github.com>
Date:   Tue Apr 13 12:22:34 2021 -0500

    Sync files with networkservicemesh/cmd-template

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:7f6d2da0
+          image: networkservicemeshci/cmd-nse-icmp-responder-vpp:4de1efd6
           imagePullPolicy: IfNotPresent
           env:
             - name: SPIFFE_ENDPOINT_SOCKET