[url-check] New broken URLs detected

[github-actions]

The weekly URL audit found 1 broken URL(s) in repo that are not in .url_check_allowlist.txt.

If these are genuinely-broken-but-acceptable (paywalled, dead-external, etc.), append them to .url_check_allowlist.txt to grandfather them. Otherwise fix the references in-repo.

https://www.astro.caltech.edu/~george/qsolens/

• status: ConnectTimeout: HTTPSConnectionPool(host='sites.astro.caltech.edu', port=443): Max retries exceeded with url: /~george/qsolens/ (Caused by ConnectTimeoutError(<HTTPSConnection(
• referenced from 2 site(s):
  • scripts/chapter_1_introduction/tutorial_1_grids_and_galaxies.py:14
  • notebooks/chapter_1_introduction/tutorial_1_grids_and_galaxies.ipynb:19

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