This method is used together with updateUser() when a user's password needs to be updated.
If you require your user to reauthenticate before updating their password, you need to enable the Secure password change option in your project's email provider settings.
A user is only require to reauthenticate before updating their password if Secure password change is enabled and the user hasn't recently signed in. A user is deemed recently signed in if the session was created in the last 24 hours.
This method will send a nonce to the user's email. If the user doesn't have a confirmed email address, the method will send the nonce to the user's confirmed phone number instead.