markdown-link-check failing on good links

[ChrisDick]

Context
#269 has a failed check, but all the links flagged are ok. opening this to track when it's happening and which links. so far it's only github and printables that are affected.

FILE: docs/tildagon-apps/examples/detect-hexpansion.md
[✖] https://github.com/walkerdanny/caffeine-jitters/blob/main/app.py

1 links checked.

ERROR: 1 dead links found!
[✖] https://github.com/walkerdanny/caffeine-jitters/blob/main/app.py → Status: 429

FILE: docs/tildagon-apps/reference/badge-hardware.md
[✖] https://github.com/emfcamp/badge-2024-software/blob/main/modules/firmware_apps/intro_app.py

11 links checked.

ERROR: 1 dead links found!
[✖] https://github.com/emfcamp/badge-2024-software/blob/main/modules/firmware_apps/intro_app.py → Status: 429


FILE: docs/using-the-badge/accessory-ideas.md
[✖] https://www.printables.com/model/909352-tildagon-stand
[✖] https://www.printables.com/model/924600-hexpansion-storage-for-emf-camp-tildagon-badge
[✖] https://www.printables.com/model/921786-tildagon-tildacase
[✖] https://www.printables.com/model/947947-tildagon-tildacase-with-in-case-usb-c

17 links checked.

ERROR: 4 dead links found!
[✖] https://www.printables.com/model/909352-tildagon-stand → Status: 0
[✖] https://www.printables.com/model/924600-hexpansion-storage-for-emf-camp-tildagon-badge → Status: 0
[✖] https://www.printables.com/model/921786-tildagon-tildacase → Status: 0
[✖] https://www.printables.com/model/947947-tildagon-tildacase-with-in-case-usb-c → Status: 0