This error message means that Git cannot establish a connection with the remote repository on GitHub. Possible reasons are network outages, GitHub's server maintenance, or lack of permissions required by the remote repository.
The solution is: wait for about two or three minutes, don't worry, this is only caused by unstable network, you will be fine after a while, don't worry. \(^ ^)/
But if it still doesn’t work after waiting for a long time, there may be other problems, please refer to other articles for details!