message: Replace default version from v5 to v6
diff: @@ -109,7 +109,7 @@ func (checker *Checker) Check(ctx context.Context) error {
  mode := "direct"
  digestValidate := false
  if targetParsed.NydusImage != nil {
  - v := utils.GetNydusFsVersionOrDefault(targetParsed.NydusImage.Manifest.Annotations, utils.V6)
  + v := utils.GetNydusFsVersionOrDefault(targetParsed.NydusImage.Manifest.Annotations, utils.V5)
  if v == utils.V5 {
  // Digest validate is not currently supported for v6,
  // but v5 supports it. In order to make the check more sufficient,
  