vendor: update buildkit with typed errors support

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

vendor/github.com/docker/cli/cli-plugins/manager/error.go

@@ -25,6 +25,11 @@ func (e *pluginError) Cause() error {
 	return e.cause
 }
 
+// Unwrap provides compatibility for Go 1.13 error chains.
+func (e *pluginError) Unwrap() error {
+	return e.cause
+}
+
 // MarshalText marshalls the pluginError into a textual form.
 func (e *pluginError) MarshalText() (text []byte, err error) {
 	return []byte(e.cause.Error()), nil

vendor/github.com/docker/cli/cli-plugins/manager/manager.go

@@ -11,8 +11,8 @@ import (
 
 	"github.com/docker/cli/cli/command"
 	"github.com/docker/cli/cli/config"
+	"github.com/fvbommel/sortorder"
 	"github.com/spf13/cobra"
-	"vbom.ml/util/sortorder"
 )
 
 // ReexecEnvvar is the name of an ennvar which is set to the command

vendor/github.com/docker/cli/cli-plugins/manager/metadata.go

@@ -10,7 +10,7 @@ const (
 	MetadataSubcommandName = "docker-cli-plugin-metadata"
 )
 
-// Metadata provided by the plugin. See docs/extend/cli_plugins.md for canonical information.
+// Metadata provided by the plugin.
 type Metadata struct {
 	// SchemaVersion describes the version of this struct. Mandatory, must be "0.1.0"
 	SchemaVersion string `json:",omitempty"`