It often takes a lot of time to synchronize the compose across all mirrors,
so it's safer to use just one, otherwise we can get hit by 404s if the
compose isn't available yet by a mirror.
Signed-off-by: Ondřej Budai <ondrej@budai.cz>
It no longer makes sense because:
- we don't make any changes to 8.5
- we don't regenerate test manifests for 8.5
- osbuild-composer for 8.5 is in the rhel-8.5.0 branch
Also, the latest-8.5.0 symlink was removed, which broke the CI.
Signed-off-by: Ondřej Budai <ondrej@budai.cz>