update grpc api

clustering/agent.go

@@ -60,9 +60,13 @@ func (f defaultAgentFactory) New(ctx context.Context, cluster *mocov1beta2.MySQL
 		Time: 1 * time.Minute,
 	}
 	cred := credentials.NewTLS(f.reloader.TLSClientConfig())
-	conn, err := grpc.DialContext(ctx, addr,
+	/*  
+		"grpc.WithBlock() DialOption" is deleted in NewClient
+		Please see, https://pkg.go.dev/google.golang.org/grpc#WithBlock
+		this DialOption is not supported by NewClient. Will be supported throughout 1.x.
+	*/
+	conn, err := grpc.NewClient(addr,
 		grpc.WithAuthority(cluster.PodHostname(index)),
-		grpc.WithBlock(),
 		grpc.WithTransportCredentials(cred),
 		grpc.WithKeepaliveParams(kp))
 	if err != nil {