Fix CI: bump OpenAstronomy/github-actions-workflows to v3.0.3, fix stale docs links

[keflavich]

Summary

CI Tests and Wheel building have both been intermittently red on main (and on unrelated PRs, e.g. #611) for weeks, unrelated to the actual PR contents. This tracks down and fixes the root causes.

• Load tox environments / wheel-building set_env step failing with:

  This package needs a Python matching '==3.12' and none of the interpreters on
  this system does.
  

  This is a known bug in OpenAstronomy/github-actions-workflows v2.6.x's pipx run helper scripts, fixed upstream in v3.0.2 ("allow running python helper scripts with any Python 3.12.x patch version" — OpenAstronomy/github-actions-workflows#410). Bumps the pinned SHA in ci_tests.yml and publish.yml from v2.6.3 to v3.0.3 (latest).

• Coverage upload compatibility: v3.0.0 introduced a breaking change requiring a .coverage file at the repo root for the Codecov upload step. Our tox.ini runs tests in .tmp/{envname} via changedir, so pytest-cov was writing .coverage there instead of the root. Added COVERAGE_FILE={toxinidir}/.coverage for the cov factor so it lands where the new step expects it.

• ci_tests / Link checks and the ReadTheDocs build, failing for reasons unrelated to the above:

  • Three docstrings in astroplan/plots/time_dependent.py still referenced ~matplotlib.pyplot.plot_date, left over from before Replace deprecated plot_date with plot #636 replaced the actual ax.plot_date(...) calls with ax.plot(...). Under Sphinx's nitpicky mode this is now an unresolvable cross-reference. Updated the docstrings to match the current code.
  • The Seaborn link in docs/tutorials/plots.rst pointed at its old, long-defunct stanford.edu URL; repointed at seaborn.pydata.org.
  • ADS's abstract pages (cited in docs/index.rst) return HTTP 405 to any non-browser request — confirmed via curl that this is an anti-bot WAF challenge (x-amzn-waf-action: captcha), not a dead link. Added to linkcheck_ignore.

Test plan

Verified locally (Python 3.12, since this repo now requires >=3.11):

• tox -e linkcheck — was failing on the stale plot_date refs + seaborn + ADS links, now passes cleanly
• tox -e build_docs — passes
• tox -e codestyle — passes
• tox -e py312-test — 63 passed, 45 skipped (skips are alldeps-only tests; astroquery isn't in the minimal test extras)

The Load tox environments / wheel-building bug is upstream and non-deterministic on the runner side, so it can't be reproduced locally — the fix is simply picking up the upstream release that resolves it.

🤖 Generated with Claude Code

https://claude.ai/code/session_01VkT4NVaQsUuACEfxpqtESS

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.57%. Comparing base (1414bac) to head (5d5e006).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #640      +/-   ##
==========================================
+ Coverage   76.28%   76.57%   +0.28%     
==========================================
  Files          14       14              
  Lines        1851     1844       -7     
==========================================
  Hits         1412     1412              
+ Misses        439      432       -7     

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[keflavich]

I've reviewed this (human adam here, not adam.claude) and it all looks like safe and correct infrastructure corrections. Merging.