VOL-3978 - update to go 1.16.3

Change-Id: I3bc24ba662517badac4ddb238930550624c408a6
diff --git a/go.mod b/go.mod
index 8141781..4960581 100644
--- a/go.mod
+++ b/go.mod
@@ -1,13 +1,13 @@
 module github.com/opencord/voltha-go
 
-go 1.13
+go 1.16
 
 require (
 	github.com/gogo/protobuf v1.3.2
 	github.com/golang/protobuf v1.3.2
 	github.com/google/uuid v1.1.1
-	github.com/opencord/voltha-lib-go/v4 v4.2.2
-	github.com/opencord/voltha-protos/v4 v4.0.13
+	github.com/opencord/voltha-lib-go/v4 v4.2.3
+	github.com/opencord/voltha-protos/v4 v4.1.0
 	github.com/opentracing/opentracing-go v1.1.0
 	github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2
 	github.com/stretchr/testify v1.4.0