I looked for outdated links related to the GitLab migration. These are
the only ones I found. There were also some links to various bug
reports in the old Bugzilla, but those don't really need updating, since
Bugzilla should stay readable for a long time.
BlueZ 4 is no longer supported by BlueZ community for a long long time,
also by moving to BlueZ 5 it should make it even more clearer that
BlueZ 4 is no longer an option.