Git commits in Moodle 3.9.7 by Huong Nguyen

commit b28b6066b42ae00bc03fcf65ca2df95ce4272aea
Author: Huong Nguyen <huongn@moodle.com>
Date:   Thu, 22 Apr 2021 12:01:09 +0800
Tag:    v3.9.7

MDL-70720 Quiz: Improve capability checks when fetching users' best grades