vendor: update all dependencies to latest versions

vendor/cloud.google.com/go/trace/grpc_test.go

@@ -28,6 +28,8 @@ import (
 )
 
 func TestGRPCInterceptors(t *testing.T) {
+	t.Skip("hangs forever for go < 1.9")
+
 	tc := newTestClient(&noopTransport{})
 
 	// default sampling with global=1.
@@ -142,7 +144,7 @@ func testGRPCInterceptor(t *testing.T, tc *Client, parent *Span, assert func(t *
 	}()
 
 	addr := <-addrCh
-	conn, err := grpc.Dial(addr.String(), grpc.WithInsecure(), grpc.WithUnaryInterceptor(tc.GRPCClientInterceptor()))
+	conn, err := grpc.Dial(addr.String(), grpc.WithInsecure(), grpc.WithBlock(), grpc.WithUnaryInterceptor(tc.GRPCClientInterceptor()))
 	if err != nil {
 		t.Fatalf("Did not connect: %v", err)
 	}