vendor: update all dependencies to latest versions

vendor/cloud.google.com/go/pubsub/loadtest/benchmark_test.go

@@ -31,7 +31,7 @@ import (
 
 	"cloud.google.com/go/internal/testutil"
 	"cloud.google.com/go/pubsub"
-	"google.golang.org/api/transport"
+	gtransport "google.golang.org/api/transport/grpc"
 	pb "google.golang.org/genproto/googleapis/pubsub/v1"
 )
 
@@ -100,9 +100,13 @@ func perfClient(pubDelay time.Duration, nConns int, f interface {
 	if err != nil {
 		f.Fatal(err)
 	}
-	conn, err := transport.DialGRPCInsecure(ctx,
+	conn, err := gtransport.DialInsecure(ctx,
 		option.WithEndpoint(srv.Addr),
-		option.WithGRPCConnectionPool(nConns))
+		option.WithGRPCConnectionPool(nConns),
+
+		// TODO(grpc/grpc-go#1388) using connection pool without WithBlock
+		// can cause RPCs to fail randomly. We can delete this after the issue is fixed.
+		option.WithGRPCDialOption(grpc.WithBlock()))
 	if err != nil {
 		f.Fatal(err)
 	}

vendor/cloud.google.com/go/pubsub/loadtest/loadtest.go

@@ -22,6 +22,7 @@ import (
 	"bytes"
 	"errors"
 	"log"
+	"runtime"
 	"strconv"
 	"sync"
 	"sync/atomic"
@@ -150,6 +151,7 @@ func (s *SubServer) Start(ctx context.Context, req *pb.StartRequest) (*pb.StartR
 	// Load test API doesn't define any way to stop right now.
 	go func() {
 		sub := c.Subscription(req.GetPubsubOptions().Subscription)
+		sub.ReceiveSettings.NumGoroutines = 10 * runtime.GOMAXPROCS(0)
 		err := sub.Receive(context.Background(), s.callback)
 		log.Fatal(err)
 	}()