我在用Git-bash配置SSH key的时候，输完

ssh -T git@github.com

显示

The authenticity of host 'github.com (20.205.243.166)' can't be established.
ED25519 key fingerprint is SHA256:+DiY3wvvV6TuJJ-------/zLDA0zPMS------------.
This key is not known by any other names.
Are you sure you want to continue connecting (yes/no/[fingerprint])?

是什么情况啊（中间我杠了一些）