Use new projects REST API ✨

[edgarrmondragon]

• https://github.com/community/maintainers/discussions/583#discussioncomment-14236559
• https://github.blog/changelog/2025-09-11-a-rest-api-for-github-projects-sub-issues-improvements-and-more/
• https://docs.github.com/en/rest/projects?apiVersion=2022-11-28