VOL-3589 Update voltha go to support new version v4 of voltha protos

Change-Id: I32074b5c05b08f8ebd2205f8dc2af225bff465cc
diff --git a/rw_core/flowdecomposition/flow_decomposer.go b/rw_core/flowdecomposition/flow_decomposer.go
index 986d911..236570d 100644
--- a/rw_core/flowdecomposition/flow_decomposer.go
+++ b/rw_core/flowdecomposition/flow_decomposer.go
@@ -22,10 +22,10 @@
 
 	"github.com/gogo/protobuf/proto"
 	"github.com/opencord/voltha-go/rw_core/route"
-	fu "github.com/opencord/voltha-lib-go/v3/pkg/flows"
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
-	ofp "github.com/opencord/voltha-protos/v3/go/openflow_13"
-	"github.com/opencord/voltha-protos/v3/go/voltha"
+	fu "github.com/opencord/voltha-lib-go/v4/pkg/flows"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
+	ofp "github.com/opencord/voltha-protos/v4/go/openflow_13"
+	"github.com/opencord/voltha-protos/v4/go/voltha"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 )