Ohai,
I’ve just moved Foreman 3.5, 3.6 and 3.7 from deb.theforeman.org to archivedeb.theforeman.org.
3.7.1 was released in November 2023, over a year ago, and hasn’t received any updates since.
If you’re still running such an old release, please keep in mind that it’s unsupported and try to plan an upgrade to a supported version ASAP.
Evgeni