How to fix the git warning "ECDSA host key for 'github.com' differs from the key for the IP address '140.82.113.3'"

If GitHub's recent RSA SSH host key update causes your system to throw this error:

Warning: the ECDSA host key for 'github.com' differs from the key for the IP address '140.82.113.3'

The solution is a quick fix. The next lines of the error will read something like this:

Offending key for IP in ~/.ssh/known_hosts:X
Matching host key in ~/.ssh/known_hosts:Y
Are you sure you want to continue connecting (yes/no)?

Where X is the line number containing the IP address we want to remove. So...

Run the following command:

vi ~/.ssh/known_hosts

And ⬇️ to line X and run the following to delete the line and exit vi:

dd
:x

Voila!