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

…d-nsmgr-proxy@main

PR link: https://github.com/networkservicemesh/cmd-nsmgr-proxy/pull/

Commit: a6c0eec
Author: Denis Tingaikin
Date: 2021-10-11 12:16:20 +0300
Message:
  - Merge pull request #228 from Mixaster995/feature/log-level
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:6368aec
+        - image: ghcr.io/networkservicemesh/ci/cmd-nsmgr-proxy:a6c0eec
           imagePullPolicy: IfNotPresent
           name: nsmgr-proxy
           ports: