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
Check your git config credential.helper:
if it is manager, you would need to open your Windows Credential Manager and remove your credentials there.
See this answer for illustration.
git credential-manager reject https://github.com
if it is a osxkeychain, see "Updating credentials from the OSX Keychain"
git credential-osxkeychain erase https://github.com
Reminder, those credentials (username/password) have nothing to do with your git config user.name/user.email.