VOL-3588 Update OFAgent to support new version of protos

Change-Id: Ic3944779f9a600ebcd5d7a916616f473059e311e
diff --git a/internal/pkg/ofagent/connection.go b/internal/pkg/ofagent/connection.go
index a518638..6bfd0af 100644
--- a/internal/pkg/ofagent/connection.go
+++ b/internal/pkg/ofagent/connection.go
@@ -23,9 +23,9 @@
 	"github.com/golang/protobuf/ptypes/empty"
 	grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
 	grpc_opentracing "github.com/grpc-ecosystem/go-grpc-middleware/tracing/opentracing"
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
-	"github.com/opencord/voltha-lib-go/v3/pkg/probe"
-	"github.com/opencord/voltha-protos/v3/go/voltha"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
+	"github.com/opencord/voltha-lib-go/v4/pkg/probe"
+	"github.com/opencord/voltha-protos/v4/go/voltha"
 	"google.golang.org/grpc"
 )