Git commits in Moodle 3.5.17 by Sander Wind

commit acfb9efa25fc79896b86f5a2a99efa4060bd8ae4
Author: Sander Wind <bandjes-moodle@intigriti.me>
Date:   Tue, 19 Jan 2021 16:05:41 +0800
Tag:    v3.5.17

MDL-70668 auth: Fix secret validation during user confirmation