Please check the roadmap to see what's new.
2.4 did not make it to Debian 13 (trixie) proper, but the regular upgrade channel for 2.4. will (eventually) be trixie-backports.
Please upgrade your system to Debian 13 (trixie) and use trixie-backports (or Hellfield's trixie-ab-snasphot as long as trixie-backports isn't open) as update channel.
2.2.x compat update channel
With this release, updates to 2.2.x stable will no longer be available directly via Debian (Debian trixie w/o backports is stuck with 2.2.8).
You may use:
deb [] http://debian.installiert.net/hellfield/ablg trixie-ablg-snapshot main contrib non-free non-free-firmware
for compat 2.2.x; upgrades will eventually phase out, though.