Debian old-stable repo updates to buster

Hi

I've just noticed that the DMO Debian stable repo has been updated to
Trixie, however old-stable is still set to buster:

# apt update
# apt list --upgradable

libavcodec58/oldstable 10:4.4.6-dmo1+deb11u1 amd64 [upgradable from:
10:4.4.5-dmo0+deb12u1]
...

Thanks
Scott