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

…d-nsc-vpp@main

PR link: https://github.com/networkservicemesh/cmd-nsc-vpp/pull/

Commit: 1bb0645
Author: Artem Glazychev
Date: 2021-08-19 19:19:37 +0700
Message:
  - Upgrade to VPP v21.06 (#230)
Signed-off-by: NSMBot <nsmbot@networkservicmesh.io>

apps/nsc-memif/nsc.yaml

@@ -16,7 +16,7 @@ spec:
     spec:
       containers:
         - name: nsc
-          image: ghcr.io/networkservicemesh/ci/cmd-nsc-vpp:f89880f
+          image: ghcr.io/networkservicemesh/ci/cmd-nsc-vpp:1bb0645
           imagePullPolicy: IfNotPresent
           env:
             - name: NSM_REQUEST_TIMEOUT