Add patch to normalise signature across whitespace changes (and therefore across Python interpreter versions). (Closes: #1096009)

Patches: add replace-removed-assert_-with-assertTrue.patch to make the tests work with Python 3.12. (Closes: #1056434)

Fix some issues reported by lintian

See merge request python-team/packages/ply!4

Changes-By: lintian-brush
Fixes: lintian: out-of-date-standards-version
See-also: https://lintian.debian.org/tags/out-of-date-standards-version.html

Changes-By: lintian-brush
Fixes: lintian: older-debian-watch-file-standard
See-also: https://lintian.debian.org/tags/older-debian-watch-file-standard.html

* Copyright: use my debian.org email address.
* Control: set maintainer to my debian.org email address.

Remove python-pycparser binary package now that pypy & pypy3 can build without it. Thanks Lukas Märdian for the patch. (Closes: #937304)

Control: replace build-depend on python2 with dh-sequence-python2; bump compat level to 13 (from 12).

This reverts commit c420e5fc.