Git commits in Moodle 3.11.8 by Peter Burnett

commit 1f7a90fbe21196fa3d46d501c7490a08cd3083de
Author: Peter Burnett <peterburnett@catalyst-au.net>
Date:   Mon, 16 Aug 2021 10:07:07 +0800
Tag:    v3.11.8

MDL-72324 upgrade: Fix incompatible check in upgrade to match docs