How to remove GitHub password from VSCode?

I have cloned one of my GitHub repositories with VSCode and I have made some commits. VSCode has asked me for my GitHub password when I have done the first commit.

I have rebooted the computer and now I can make commits as before, but VSCode does not ask for my password. It seems that the password has been stored. But this computer is not my computer and I do not want that somebody else could use my account.

How can I make VSCode forget my GitHub password?

I have tried the git command：

git config --global --unset-all user.email

But VSCode still lets me commit without asking.