VOL-3588 Update OFAgent to support new version of protos

Change-Id: Ic3944779f9a600ebcd5d7a916616f473059e311e
diff --git a/internal/pkg/openflow/stats_test.go b/internal/pkg/openflow/stats_test.go
index d618fe4..cad0352 100644
--- a/internal/pkg/openflow/stats_test.go
+++ b/internal/pkg/openflow/stats_test.go
@@ -26,8 +26,8 @@
 	"github.com/opencord/goloxi/of13"
 	"github.com/opencord/ofagent-go/internal/pkg/holder"
 	"github.com/opencord/ofagent-go/internal/pkg/mock"
-	"github.com/opencord/voltha-protos/v3/go/openflow_13"
-	"github.com/opencord/voltha-protos/v3/go/voltha"
+	"github.com/opencord/voltha-protos/v4/go/openflow_13"
+	"github.com/opencord/voltha-protos/v4/go/voltha"
 	"github.com/stretchr/testify/assert"
 )