这是由于设置了代理，现在代理不可用了，可以运行下面的语句查看一下
$ git config --global http.proxy
会输出配置代理的信息
然后输入下面的语句重置一下就好了
$ git config --global --unset http.proxy
fatal: unable to access 'https://github.com/xxx': Connection timed out after 300040 milliseconds
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