Git commits in Moodle 3.11.x by Huong Nguyen

commit 89fe45e38c1cae792808f46b9fc671ce8e375011
Author: Huong Nguyen <huongnv13@gmail.com>
Date:   Thu, 01 Apr 2021 15:11:19 +0800
Tag:    v3.11.0-beta

MDL-70947 File upload: Upload protection

commit 0cc42a20474c6d918e87237b1503bc7ef37abae9
Author: Huong Nguyen <huongnv13@gmail.com>
Date:   Tue, 08 Dec 2020 17:04:09 +0800
Tag:    v3.11.0-beta

MDL-70426 qtype_ddmarker: infinite markers keep duplicating

commit d921cbb41f4b29af7250f38f1821b743ccad5fd2
Author: Huong Nguyen <huongnv13@gmail.com>
Date:   Wed, 18 Nov 2020 17:09:05 +0800
Tag:    v3.11.0-beta

MDL-70248 qtype_ddimageortext: Drop zones have UI issue in Editing form