Test apexpy release candidates

[aburrell]

Description

Fixes the MacOS call for external RC testing.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Ran here: https://github.com/pysat/pysatMissions/actions/runs/12587268120/job/35082761515

Test Configuration

• Operating system: GA
• Version number: Python 3.12
• Any details about your local setup that are relevant

Checklist:

• Make sure you are merging into the develop (not main) branch
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• Add a note to CHANGELOG.md, summarizing the changes
• Update zenodo.json file for new code contributors

If this is a release PR, replace the first item of the above checklist with the
release checklist on the pysat wiki:
https://github.com/pysat/pysat/wiki/Checklist-for-Release

[jklenzing]

Looks good. I've added #126 to update the main.yml once the new apexpy is released.