Description of problem:
-----------------------
Incorrect version of package, `rubygem-foreman_maintain` installed will provide the following output when executing, `satellite-maintain upgrade list-versions` on satellite server:

Checking for new version of satellite-maintain...
Nothing to update, can't find new version of satellite-maintain.

Version-Release number of selected component (if applicable):
-------------------------------------------------------------
rubygem-foreman_maintain (Not version specific, but specific to the requirements of the Satellite version)

How reproducible:
-----------------
100%

Steps to Reproduce:
-------------------
1. Have a Satellite on version X (6.12) needing to upgrade to version Y (6.13)
2. Have any version repository `satellite-maintenance-6.-for-rhel-8-x86_64-rpms` enabled Y+1 (6.14 | 6.15)
3. Execute `satellite-maintain upgrade list-versions` and rubygem-foreman_maintain will update to the highest available version
4. Execute `satellite-maintain upgrade list-versions` once more:

Checking for new version of satellite-maintain...
Nothing to update, can't find new version of satellite-maintain.

Actual results:
---------------

Checking for new version of satellite-maintain...
Nothing to update, can't find new version of satellite-maintain.

Expected results:
-----------------

Proper version should be displayed. For Satellite 6.12: 6.12.z and 6.13 options should be present.

Work Around:
------------

1. Understand the current version of Satellite and repositories enabled.

1. rpm -q satellite
2. subscription-manager repos --list-enabled

2. Execute, `yum downgrade rubygem-foreman_maintain` if the current satellite repository version is enabled which provides the required rubygem-foreman_maintain version.

3. Execute `satellite-maintain upgrade list-versions` and verify proper output is presented.

4. Follow the rest of the upgrade documentation.