Replace scipy's romberg with quad.

[mkelley]

Romberg will be removed from scipy in v1.15.0.

Closes #399

[github-actions]

Thank you for your contribution to sbpy, an Astropy affiliated package! 🌌 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 sbpy coding guidelines?
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.19%. Comparing base (813fe61) to head (25f87dd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #412   +/-   ##
=======================================
  Coverage   83.19%   83.19%           
=======================================
  Files          88       88           
  Lines        8183     8183           
=======================================
  Hits         6808     6808           
  Misses       1375     1375           

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[hhsieh00]

Looks fine to me. Codecov shows some uncovered code on the code diffs page, but gives a passing review on the main page + some of the ostensibly uncovered lines are related to package importing so looks like that might be considered an "uncoverable" line that the main Codecov report is happy to ignore.

[mkelley]

If one visits the checks page https://github.com/NASA-Planetary-Science/sbpy/pull/412/checks?check_run_id=29881366244 and hits refresh, those uncovered lines disappear. I've searched the internet for a solution on how to refresh the "Files changed" tab, but I've not found a solution.