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

…d-nse-icmp-responder-vpp@main

PR link: networkservicemesh/cmd-nse-icmp-responder-vpp#334

Commit: 51d97ef
Author: Denis Tingaikin
Date: 2022-01-17 05:24:58 +0300
Message:
  - Merge pull request #334 from NikitaSkrynnik/update-manually
Signed-off-by: NSMBot <nsmbot@networkservicmesh.io>

apps/nse-memif/nse.yaml

@@ -17,7 +17,7 @@ spec:
     spec:
       containers:
         - name: nse
-          image: ghcr.io/networkservicemesh/ci/cmd-nse-icmp-responder-vpp:19089f1
+          image: ghcr.io/networkservicemesh/ci/cmd-nse-icmp-responder-vpp:51d97ef
           imagePullPolicy: IfNotPresent
           env:
             - name: SPIFFE_ENDPOINT_SOCKET