Git commits in Moodle 3.7.9 by Andrew Nicols

commit cbc2ed8aa5fa8f8e7c4124c75f029c2d947d73a6
Author: Andrew Nicols <andrew@nicols.co.uk>
Date:   Wed, 28 Oct 2020 09:27:15 +0800
Tag:    v3.7.9

MDL-69815 core: Bump Node to v14.15.0 (LTS/Fermium)