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

…d-forwarder-vpp@main

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

Commit: 6b1ee19
Author: Artem Glazychev
Date: 2021-08-18 21:13:35 +0700
Message:
  - Upgrade to VPP v21.06 (#321)
Signed-off-by: NSMBot <nsmbot@networkservicmesh.io>

apps/forwarder-vpp/forwarder.yaml

@@ -16,7 +16,7 @@ spec:
     spec:
       hostNetwork: true
       containers:
-        - image: ghcr.io/networkservicemesh/ci/cmd-forwarder-vpp:e34e26a
+        - image: ghcr.io/networkservicemesh/ci/cmd-forwarder-vpp:6b1ee19
           imagePullPolicy: IfNotPresent
           name: forwarder-vpp
           securityContext: