Bump buildkit to master and fix versions incompatible with go mod 1.13

Bump github.com/gogo/googleapis to v1.3.2
Bump github.com/docker/cli to master

Signed-off-by: Silvin Lubecki <silvin.lubecki@docker.com>

vendor/github.com/containerd/continuity/fs/du_windows.go

@@ -1,82 +0,0 @@
-// +build windows
-
-/*
-   Copyright The containerd Authors.
-
-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this file except in compliance with the License.
-   You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
-*/
-
-package fs
-
-import (
-	"context"
-	"os"
-	"path/filepath"
-)
-
-func diskUsage(ctx context.Context, roots ...string) (Usage, error) {
-	var (
-		size int64
-	)
-
-	// TODO(stevvooe): Support inodes (or equivalent) for windows.
-
-	for _, root := range roots {
-		if err := filepath.Walk(root, func(path string, fi os.FileInfo, err error) error {
-			if err != nil {
-				return err
-			}
-
-			select {
-			case <-ctx.Done():
-				return ctx.Err()
-			default:
-			}
-
-			size += fi.Size()
-			return nil
-		}); err != nil {
-			return Usage{}, err
-		}
-	}
-
-	return Usage{
-		Size: size,
-	}, nil
-}
-
-func diffUsage(ctx context.Context, a, b string) (Usage, error) {
-	var (
-		size int64
-	)
-
-	if err := Changes(ctx, a, b, func(kind ChangeKind, _ string, fi os.FileInfo, err error) error {
-		if err != nil {
-			return err
-		}
-
-		if kind == ChangeKindAdd || kind == ChangeKindModify {
-			size += fi.Size()
-
-			return nil
-
-		}
-		return nil
-	}); err != nil {
-		return Usage{}, err
-	}
-
-	return Usage{
-		Size: size,
-	}, nil
-}