Lintian links all point to NXDOMAIN lintian.debian.org

This chases https://bugs.debian.org/1053710:

$ git grep -F lintian.debian.org
debexpo/base/locale/django.pot:"can learn more about Lintian in the <a href=\"https://lintian.debian.org/"
debexpo/base/locale/fr/LC_MESSAGES/django.po:"can learn more about Lintian in the <a href=\"https://lintian.debian.org/"
debexpo/base/locale/fr/LC_MESSAGES/django.po:"sur Lintian dans le <a href=\"https://lintian.debian.org/manual/index."
debexpo/base/locale/pt_BR/LC_MESSAGES/django.po:"can learn more about Lintian in the <a href=\"https://lintian.debian.org/"
debexpo/base/locale/pt_BR/LC_MESSAGES/django.po:"<a href=\"https://lintian.debian.org/manual/index.html\">Manual do(a) "
debexpo/base/templates/qa.html:    <a href="https://lintian.debian.org/manual/index.html">Lintian User's
debexpo/plugins/templates/plugin-lintian.html:<a href="https://lintian.debian.org/tags/{{ tag }}.html">{{ tag }}</a>
old/debexpo/model/data/tags.py:     'Your package is not <a href="https://lintian.debian.org/">Lintian clean'
old/docs/plugins.rst:This plugin runs `lintian <http://lintian.debian.org/>`_ on the package.
tests/functional/importer/plugins/test_lintian.py:            'https://lintian.debian.org/tags/debian-watch-file-is-missing.html'
$ host lintian.debian.org
Host lintian.debian.org not found: 3(NXDOMAIN)

and indeed, package pages link to https://lintian.debian.org/tags/very-long-line-length-in-source-file.html, for example.

This is an issue for the lintian maintainers or the DSA to work out – indeed, archive.org says the last scrape was on 2023-09-13 and succeeded, so this is very recent breakage, to the extent that I wonder if this is purely a zone misconfiguration – but in the mean-time package pages probably shouldn't link to NXDOMAINs? I know where to look, but by definition if you're using mentors.d.n you probably want the links to be helpful instead of broken, especially with some of the more, uh. Exotic. lintian tags.