Git commits in Moodle 3.9.11 by Simey Lameze

commit 9d0d93a9c41822ff32fedb20fc87f587d213a293
Author: Simey Lameze <simey@moodle.com>
Date:   Wed, 13 Oct 2021 11:49:31 +0800
Tag:    v3.9.11

MDL-72571 tool_filetypes: change extension param to PARAM_ALPHANUMEXT