[xml/sgml-pkgs] Bug#1073258: docbook-dsssl: Directly use debhelper instead of abandoned cdbs

[Gioele Barabucci]

Package: docbook-dsssl
Version: 1.79-10
Tags: patch

Dear maintainers of docbook-dsssl,

CDBS has been deprecated by the upstream authors in 2021 and has been
orphaned in 2022, See <https://bugs.debian.org/1026085>

The current packaging already relies on debhelper, so converting the
packaging to the standard `dh` sequence is quite straightforward and
brings additional benefits like binary reproducibility fixes and support
for any future infrastructural change.

A small MR that implements the switch to dh and fixes a couple of issues 
(lintian errors, lack of RRR: no) is available at:

https://salsa.debian.org/xml-sgml-team/docbook-dsssl/-/merge_requests/2

Regards,

-- 
Gioele Barabucci