Description of problem:
foreman-maintain upgrade list-versions lists 6.14 along with 6.13.z, which doesn't exist with the current release, and 6.14 should be included by the 6.14 maintenance repo

Version-Release number of selected component (if applicable):
Satellite 6.13.0 Snap 15.0
rubygem-foreman_maintain-1.2.7-1.el8sat.noarch

How reproducible:
Always

Steps to Reproduce:
1. # foreman-maintain upgrade list-versions
Checking for new version of satellite-maintain...
Nothing to update, can't find new version of satellite-maintain.
6.13.z
6.14

Actual results:
6.14 is also listed with 6.13.z

Expected results:
Only 6.13.z is listed, and 6.14 should be listed when 6.14 maintenance repos are available and enabled

Additional info: