Comment 6 for bug 1974177

Okay, the change to check both xz and zstd style debs has kindly been accepted upstream [1] so I'm attaching a revised debdiff (3-1974177.debdiff) and I've updated the branches and tags in comment 1 with the new merge.

[1]: https://salsa.debian.org/debian/sbuild/-/merge_requests/18