use insecure.NewCredentials() instead of grpc.WithInsecure (#5087)

examples/helloworld/greeter_client/main.go

@@ -26,6 +26,7 @@ import (
 	"time"
 
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
 	pb "google.golang.org/grpc/examples/helloworld/helloworld"
 )
 
@@ -41,7 +42,7 @@ var (
 func main() {
 	flag.Parse()
 	// Set up a connection to the server.
-	conn, err := grpc.Dial(*addr, grpc.WithInsecure())
+	conn, err := grpc.Dial(*addr, grpc.WithTransportCredentials(insecure.NewCredentials()))
 	if err != nil {
 		log.Fatalf("did not connect: %v", err)
 	}