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/adapters/common/events_proxy.go b/pkg/adapters/common/events_proxy.go
index b79bafe..b16c1ae 100644
--- a/pkg/adapters/common/events_proxy.go
+++ b/pkg/adapters/common/events_proxy.go
@@ -25,10 +25,10 @@
 	"time"
 
 	"github.com/golang/protobuf/ptypes"
-	"github.com/opencord/voltha-lib-go/v3/pkg/adapters/adapterif"
-	"github.com/opencord/voltha-lib-go/v3/pkg/kafka"
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
-	"github.com/opencord/voltha-protos/v3/go/voltha"
+	"github.com/opencord/voltha-lib-go/v4/pkg/adapters/adapterif"
+	"github.com/opencord/voltha-lib-go/v4/pkg/kafka"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
+	"github.com/opencord/voltha-protos/v4/go/voltha"
 )
 
 type EventProxy struct {