Git commits in Moodle 3.5.12 by Ferran Recio

commit 9306db49a4492b5172b60b0a143fc817fd22679c
Author: Ferran Recio <ferran@moodle.com>
Date:   Mon, 04 May 2020 23:12:26 +0800
Tag:    v3.5.12

MDL-68430 filter_mathjaxloader: update default CDN to 2.7.8