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

…d-lb-vl3-vpp@main

PR link: networkservicemesh/cmd-lb-vl3-vpp#42

Commit: 2120cc3
Author: Network Service Mesh Bot
Date: 2024-01-18 02:57:44 -0600
Message:
  - Sync files with networkservicemesh/cmd-template
Signed-off-by: NSMBot <nsmbot@networkservicmesh.io>

apps/vl3-lb/lb.yaml

@@ -15,7 +15,7 @@ spec:
     spec:
       containers:
         - name: lb
-          image: ghcr.io/networkservicemesh/ci/cmd-lb-vl3-vpp:d7f5c9a
+          image: ghcr.io/networkservicemesh/ci/cmd-lb-vl3-vpp:2120cc3
           imagePullPolicy: IfNotPresent
           env:
             - name: SPIFFE_ENDPOINT_SOCKET