Fix Github's Error Message "Remote Host Identification Has Changed"

I tried to do git pull and git push on a repo this morning and found this intimidating warning message, on multiple devices.

It turned out that on March 24, 2023, Github updated its RSA SSH host keys as the previous private keys were briefly exposed in a public Github repository. Based on the instructions from this Stack Overflow post Stack Overflow post , this warning message can be removed by running:

ssh-keygen -R github.com

On your next git operation, you'll be prompted with a question whether you trust the new SSH key.

Verify that against the 4 new SSH key fingerprints published by Github, namely:

SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s (RSA)
SHA256:br9IjFspm1vxR3iA35FWE+4VTyz1hYVLIE2t1/CeyWQ (DSA - deprecated)
SHA256:p2QAMXNIC1TJYWeIOttrVc98/R1BUFWu3/LiyKgUfQM (ECDSA)
SHA256:+DiY3wvvV6TuJJhbpZisF/zLDA0zPMSvHdkr4UvCOqU (Ed25519)

That's it. Git operation is now back to normal.

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