Git commits in Moodle 3.5.11 by Brendan Cox

commit a624a368564bac620174b5401cb9aa06a497f931
Author: Brendan Cox <brendan.cox@totaralearning.com>
Date:   Wed, 02 Oct 2019 06:35:31 +0800
Tag:    v3.5.11

MDL-67175 session: set SameSite=None for Chrome 78 and above