Import error
cannot import name 'scramble_old_password' from 'pymysql._auth'

To Reproduce

from pymysql import _auth
_auth.scramble_old_password()

Hi, I had a problem with pymysql generating an attribute error in a service running on docker. Looking at the code I noticed that there is a call to a method that doesn't exist in the "_auth" file.

        elif plugin_name == b"mysql_old_password":
            data = (
                _auth.scramble_old_password(self.password, auth_packet.read_all())
                + b"\0"
            )

https://github.com/PyMySQL/PyMySQL/blob/main/pymysql/connections.py line 966.

scramble_old_password doesn't exist on _auth file anymore.