Update gomod and vendor

vendor/github.com/moby/buildkit/cache/contenthash/filehash_unix.go

@@ -0,0 +1,47 @@
+// +build !windows
+
+package contenthash
+
+import (
+	"os"
+	"syscall"
+
+	"github.com/containerd/continuity/sysx"
+	fstypes "github.com/tonistiigi/fsutil/types"
+
+	"golang.org/x/sys/unix"
+)
+
+func chmodWindowsTarEntry(perm os.FileMode) os.FileMode {
+	return perm
+}
+
+func setUnixOpt(path string, fi os.FileInfo, stat *fstypes.Stat) error {
+	s := fi.Sys().(*syscall.Stat_t)
+
+	stat.Uid = s.Uid
+	stat.Gid = s.Gid
+
+	if !fi.IsDir() {
+		if s.Mode&syscall.S_IFBLK != 0 ||
+			s.Mode&syscall.S_IFCHR != 0 {
+			stat.Devmajor = int64(unix.Major(uint64(s.Rdev)))
+			stat.Devminor = int64(unix.Minor(uint64(s.Rdev)))
+		}
+	}
+
+	attrs, err := sysx.LListxattr(path)
+	if err != nil {
+		return err
+	}
+	if len(attrs) > 0 {
+		stat.Xattrs = map[string][]byte{}
+		for _, attr := range attrs {
+			v, err := sysx.LGetxattr(path, attr)
+			if err == nil {
+				stat.Xattrs[attr] = v
+			}
+		}
+	}
+	return nil
+}