Use voltha-protos version 4.0.2
Bump major version of voltha-lib-go to 4.0.0 as this change results
in incompatible API version compared to previous version

Change-Id: I1def58361fb1d85f07d6948ebf1ffb7a92eb0d4c
diff --git a/pkg/techprofile/tech_profile_if.go b/pkg/techprofile/tech_profile_if.go
index 0af1d4e..0c5e273 100644
--- a/pkg/techprofile/tech_profile_if.go
+++ b/pkg/techprofile/tech_profile_if.go
@@ -19,8 +19,8 @@
 import (
 	"context"
 
-	"github.com/opencord/voltha-lib-go/v3/pkg/db"
-	tp_pb "github.com/opencord/voltha-protos/v3/go/tech_profile"
+	"github.com/opencord/voltha-lib-go/v4/pkg/db"
+	tp_pb "github.com/opencord/voltha-protos/v4/go/tech_profile"
 )
 
 type TechProfileIf interface {