add GitHub Actions to dependabot

[zacharyburnett]

No description provided.

[github-actions]

Thank you for your contribution! 🌌 This checklist is meant to remind the package maintainers who will review this pull request of some common things to look for.

• Do the proposed changes actually accomplish desired goals?
• Do the proposed changes follow the STScI coding guidelines?
• Are tests added/updated as required? If so, do they follow the STScI testing guidelines?
• Are docs added/updated as required?
• Is rebase and/or squash necessary? If so, please provide the author with appropriate instructions.
• Did the CI pass? If no, are the failures related?
• Is a change log needed?
• Is a milestone set? Milestone must be set but we cannot check for it on Actions; do not let the green checkmark fool you.

[github-actions]

👋 Thank you for your draft pull request! Do you know that you can use [ci skip] or [skip ci] in your commit messages to skip running continuous integration tests until you are ready?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f6ddfc5) 96.80% compared to head (c63e39c) 96.80%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #377   +/-   ##
=======================================
  Coverage   96.80%   96.80%           
=======================================
  Files          17       17           
  Lines        2034     2034           
=======================================
  Hits         1969     1969           
  Misses         65       65           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[pllim]

Thanks! Only one way to find out.