VOL-3978 - update to go 1.16.3

Change-Id: Ifb1ca441ada40100f68ab31430eab357b1ab7f1f
diff --git a/go.mod b/go.mod
index 72cb5b0..57ec840 100644
--- a/go.mod
+++ b/go.mod
@@ -1,11 +1,11 @@
 module github.com/opencord/bbsim-sadis-server
 
-go 1.13
+go 1.16
 
 require (
 	github.com/gorilla/mux v1.8.0
 	github.com/imdario/mergo v0.3.11 // indirect
-	github.com/opencord/voltha-lib-go/v4 v4.0.3
+	github.com/opencord/voltha-lib-go/v4 v4.2.3
 	gotest.tools v2.2.0+incompatible
 	k8s.io/api v0.19.0
 	k8s.io/apimachinery v0.19.0