Help phase out old/dead Gnome libraries [forky]

Call from help from Debian GNOME Maintainers, for Debian 14/forky:

[libsoup2.4] is one of several former GNOME libraries that is dead upstream and should be removed from Debian, but cannot be removed because it still has rdeps. If someone in the LTS team has time available for preemptively reducing the support cost of old libraries that are dead upstream in future LTS releases, any progress towards reducing the length of https://udd.debian.org/cgi-bin/bts-usertags.cgi?user=pkg-gnome-maintainers%40lists.alioth.debian.org&tag=oldlibs would be very welcome.

Context: https://lists.debian.org/debian-lts/2025/05/msg00048.html