up timeout to 5min

[TylerLeonhardt]

1min isn't long enough. For me to access the Microsoft/vscode repo fresh with GitHub Repositories extension, I have to do:

1. Login to password manager
2. fill username in password into GitHub login page
3. 2FA using Yubikey
4. Start SAML flow for Microsoft org
5. fill username and password of Corp Microsoft account
6. Phone authenticator for Corp Microsoft account
7. redirect back to GitHub on success
8. continue on SAML page
9. redirect to vscode.dev to finally complete the login

If I forget my Yubikey downstairs, forget it. So 5min should be a bit friendlier.