vendor: update buildkit with typed errors support

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

vendor/github.com/tonistiigi/fsutil/chtimes_nolinux.go

@@ -5,16 +5,18 @@ package fsutil
 import (
 	"os"
 	"time"
+
+	"github.com/pkg/errors"
 )
 
 func chtimes(path string, un int64) error {
 	mtime := time.Unix(0, un)
 	fi, err := os.Lstat(path)
 	if err != nil {
-		return err
+		return errors.WithStack(err)
 	}
 	if fi.Mode()&os.ModeSymlink != 0 {
 		return nil
 	}
-	return os.Chtimes(path, mtime, mtime)
+	return errors.WithStack(os.Chtimes(path, mtime, mtime))
 }