Enforce 2FA for repository writers, maintainers by 2023-09-22

[smoy]

I really like to enforce the organization settings for folks have write access to have 2FA enabled.

If I enable it, and there are still folks not enable 2FA, they will lose write access to the repository. So I like to have a two week grace period and enforce it starting on 2023-09-22.

https://docs.github.com/en/authentication/securing-your-account-with-two-factor-authentication-2fa