updating voltha-lib-go for VOL-4994

Change-Id: Ic6275762212d895bfaa7eb295ee0d9d09fdf29ae
diff --git a/go.mod b/go.mod
index 66fd3ad..8129508 100644
--- a/go.mod
+++ b/go.mod
@@ -17,7 +17,7 @@
 	github.com/golang/mock v1.6.0
 	github.com/golang/protobuf v1.5.2
 	github.com/google/uuid v1.3.0
-	github.com/opencord/voltha-lib-go/v7 v7.4.2
+	github.com/opencord/voltha-lib-go/v7 v7.4.3
 	github.com/opencord/voltha-protos/v5 v5.4.6
 	github.com/opentracing/opentracing-go v1.2.0
 	github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2