Git commits in Moodle 3.9.9 by Michael Hawkins

commit 0d3495e6b2d65d607bd2039e219337532dbb9a80
Author: Michael Hawkins <michaelh@moodle.com>
Date:   Tue, 27 Jul 2021 23:25:21 +0800
Tag:    v3.9.9

MDL-72203 curl: Improve redirect unit testing and update upgrade.txt