Add a github cron job

[mwcraig]

We just got bit by a bug caused by a new release of photutils. Adding a cron job, which will include at least one test with the latest version of dependencies, should help catch this kind of thing in the future.

This does need to have one job added in tox, I think, that unpins photutils, or maybe runs against a dev version of photutils, before this can be merged

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 80.32%. Comparing base (b9bf579) to head (7798b15). Report is 14 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #478 +/- ## ======================================= Coverage 80.32% 80.32% ======================================= Files 32 32 Lines 4067 4067 ======================================= Hits 3267 3267 Misses 800 800 ```

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[mwcraig]

Yes, that would help catch things like the change in photutils...