Git commits in Moodle 3.9.15 by Daniel Ziegenberg

commit 05847affc1a8e77a432610c965e41afa8152dc81
Author: Daniel Ziegenberg <daniel@ziegenberg.at>
Date:   Mon, 23 May 2022 05:46:11 +0800
Tag:    v3.9.15

MDL-74835 ci: Update nodejs version in travis integration to lts/gallium