Git commits in Moodle 3.11.3 by Leon Stringer

commit 3236bae2ed38561dfbf3938c585d423eabd75335
Author: Leon Stringer <leon.stringer@ntlworld.com>
Date:   Wed, 30 Jun 2021 22:01:11 +0800
Tag:    v3.11.3

MDL-72035 csvlib: Write BOM for Excel