Git commits in Moodle 3.9.7 by Mathew May

commit 2c73122c607120ab522a4f4dc30296855bae9af8
Author: Mathew May <mathewm@hotmail.co.nz>
Date:   Thu, 22 Apr 2021 13:26:10 +0800
Tag:    v3.9.7

MDL-70622 mod_lti: Tighten redirect param typing