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/docker/cli/opts/config.go

@@ -32,7 +32,7 @@ func (o *ConfigOpt) Set(value string) error {
 	}
 
 	// support a simple syntax of --config foo
-	if len(fields) == 1 {
+	if len(fields) == 1 && !strings.Contains(fields[0], "=") {
 		options.File.Name = fields[0]
 		options.ConfigName = fields[0]
 		o.values = append(o.values, options)
@@ -72,6 +72,9 @@ func (o *ConfigOpt) Set(value string) error {
 	if options.ConfigName == "" {
 		return fmt.Errorf("source is required")
 	}
+	if options.File.Name == "" {
+		options.File.Name = options.ConfigName
+	}
 
 	o.values = append(o.values, options)
 	return nil