[$] Removing Guix from Debian

As a rule, if a package is shipped with a Debian release, users can
count on it being available, and updated, for the entire
life of the release. If package foo is included in the stable
release—currently Debian 13
('trixie')—a user can
reasonably expect that it will continue to be available with security
backports as long as that release is supported, though it may not be
included in Debian 14 ('forky'). However, it is likely that the
Guix package manager will soon
be removed from the repositories for Debian 13 and
Debian 12 ('bookworm', also called oldstable).