解决 'ssh: connect to host github.com port 22: Connection timed out' error

## 问题复现

MacOS Ventura 13.1  
生成 ssh key，并将 key 添加到 github keys  
使用 ssh clone 仓库

```shell
$ git clone git@github.com:xxxxx/xxxx.git my-awesome-proj
Cloning into 'my-awesome-proj'...
ssh: connect to host github.com port 22: Connection timed out
fatal: Could not read from remote repository.
```

测试连接也 timeout

```shell
$ ssh -T git@github.com
ssh: connect to host github.com port 22: Connection timed out
```

但是可以 ping 通 github.com  
test 指定 443 可以成功

```shell
$ ssh -T -p 443 git@ssh.github.com  
Hi xxxx! You've successfully authenticated,   
but GitHub does not provide shell access.
```

## 如何解决

覆盖 ssh 的配置

```shell
vim ~/.ssh/config
```

添加以下内容

```shell
Host github.com
  Hostname ssh.github.com
  Port 443
```

重新测试一下

```shell
$ ssh -T git@github.com
Hi xxxxx! You've successfully authenticated, but GitHub does not
provide shell access.
```

clone 仓库  

```shell
$ git clone git@github.com:xxxxxx/xxxxx.git my-awesome-proj
Cloning into 'my-awesome-proj'...
remote: Enumerating objects: 15, done.
remote: Counting objects: 100% (15/15), done.
remote: Compressing objects: 100% (14/14), done.
remote: Total 15 (delta 0), reused 15 (delta 0), pack-reused 0
```