Git merges in Moodle 3.9.15 by Víctor Déniz

commit d587d8b24274c04bcb803e5f2950e51e98912424
Author: Víctor Déniz <victor@moodle.com>
Date:   Wed, 06 Jul 2022 19:13:40 +0800
Tag:    v3.9.15

Merge branch 'MDL-74835-M39_update-nodejs-version-in-travis-integration-to-lts-gallium' of https://github.com/ziegenberg/moodle into MOODLE_39_STABLE


commit 4f8369c3f1f1f0149b23aea08fc2c41c7bdb2586
Author: Víctor Déniz <victor@moodle.com>
Date:   Tue, 14 Jun 2022 16:48:51 +0800
Tag:    v3.9.15

Merge branch 'MDL-74242-39-randomize_update_check' of https://github.com/mudrd8mz/moodle into MOODLE_39_STABLE