Git commits in Moodle 3.10.6 by cescobedo

commit dc8a28e4f0cc7d26cf0792d6382d7d33316361c4
Author: cescobedo <carlos.escobedo@gmail.com>
Date:   Tue, 13 Jul 2021 17:05:32 +0800
Tag:    v3.10.6

MDL-72139 core_message: Fix encoding UTF-8 in prevent unclosed tags