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

…d-map-ip-k8s@main

PR link: networkservicemesh/cmd-map-ip-k8s#29

Commit: 21a467e
Author: Network Service Mesh Bot
Date: 2022-04-06 10:45:40 -0500
Message:
  - Sync files with networkservicemesh/cmd-template
Signed-off-by: NSMBot <nsmbot@networkservicmesh.io>

apps/nsmgr-proxy/nsmgr-proxy.yaml

@@ -56,7 +56,7 @@ spec:
             limits:
               memory: 100Mi
               cpu: 400m
-        - image: ghcr.io/networkservicemesh/ci/cmd-map-ip-k8s:8b81af8
+        - image: ghcr.io/networkservicemesh/ci/cmd-map-ip-k8s:21a467e
           imagePullPolicy: IfNotPresent
           name: map-ip-k8s
           env: