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

…d-nsmgr-proxy@main

PR link: networkservicemesh/cmd-nsmgr-proxy#304

Commit: 840baad
Author: Network Service Mesh Bot
Date: 2022-03-16 05:16:33 -0500
Message:
  - Update go.mod and go.sum to latest version from networkservicemesh/sd…
Signed-off-by: NSMBot <nsmbot@networkservicmesh.io>

apps/nsmgr-proxy/nsmgr-proxy.yaml

@@ -17,7 +17,7 @@ spec:
     spec:
       serviceAccount: nsmgr-proxy-sa
       containers:
-        - image: ghcr.io/networkservicemesh/ci/cmd-nsmgr-proxy:b34a210
+        - image: ghcr.io/networkservicemesh/ci/cmd-nsmgr-proxy:840baad
           imagePullPolicy: IfNotPresent
           name: nsmgr-proxy
           ports: