If you try updating a github-based repository, you may get a dire warning about keys not matching, potential man-in-the-middle attack, someone may be watching you right now!!!
Yeah, that's not it.
"Out of an abundance of caution," says GitHub, they have reissued their keys as one or more may have been exposed publicly for a brief period. This isn't an abundance, this is a minimum good housekeeping after losing control of your keys.
Read more and instructions to update any of your access to github here:
https://github.blog/2023-03-23-we-updated-our-rsa-ssh-host-key/