sudo: Fix fetching sources

It looks like https://www.sudo.ws/download.html

 changed certificate
and directory structure. This breaks fetching sources.

Signed-off-by: Ferry Toth <ftoth@exalondelft.nl>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
(cherry picked from commit f02e9f46)
Signed-off-by: Armin Kuster <akuster808@gmail.com>