Git commits in Moodle 3.10.x by Adam Olley

commit 87883bb43c70f509f70e64e8c5c4741e72002bb6
Author: Adam Olley <adam.olley@openlms.net>
Date:   Fri, 16 Apr 2021 12:28:28 +0800
Tag:    v3.10.4

MDL-70622 mod_lti: Prevent xss on lti 1.3 authentication script