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 7b88267e6c7767302e79cb9046d8a03c6a5d588b
Author: Denis Tingaikin <49399980+denis-tingaikin@users.noreply.github.com>
Date:   Thu Mar 25 16:49:03 2021 +0700

    Merge pull request #45 from artem-belov/pr-payload-env

    NS payload from environment

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:b3c70515
+          image: networkservicemeshci/cmd-nse-icmp-responder-vpp:7b88267e
           imagePullPolicy: IfNotPresent
           env:
             - name: SPIFFE_ENDPOINT_SOCKET