Github WARNING REMOTE HOST IDENTIFICATION HAS CHANGED

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@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
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IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s.
Please contact your system administrator.
Add correct host key in /Users/bjs/.ssh/known_hosts to get rid of this message.
Offending RSA key in /Users/bjs/.ssh/known_hosts:3
RSA host key for github.com has changed and you have requested strict checking.
Host key verification failed.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

Warning: the ECDSA host key for 'github.com' differs from the key for the IP address '20.205.243.166'
Offending key for IP in /Users/bjs/.ssh/known_hosts:38
Matching host key in /Users/bjs/.ssh/known_hosts:40
Are you sure you want to continue connecting (yes/no)? yes  <------ 这里输入yes，然后按回车

删除~/.ssh/known_hosts文件，或者如果你可以判断出known_hosts中原ssh服务器的公钥，删去那部分，

然后后再次建立新的连接，即可获得新的公钥。