Add new stable branch for Moodle 4.2+ #4

Job	Run time
ci / check if job needs to run	2s
ci / prepare test matrix	20s
ci / MOODLE_39_STABLE - mariadb - php 7.2 - webservice_restful	2m 56s
ci / MOODLE_311_STABLE - mariadb - php 7.3 - webservice_restful	2m 36s
ci / MOODLE_310_STABLE - pgsql - php 7.2 - webservice_restful	3m 14s
ci / MOODLE_39_STABLE - pgsql - php 7.2 - webservice_restful	3m 37s
ci / MOODLE_39_STABLE - mariadb - php 7.3 - webservice_restful	2m 48s
ci / MOODLE_39_STABLE - pgsql - php 7.3 - webservice_restful	2m 53s
ci / MOODLE_400_STABLE - pgsql - php 7.3 - webservice_restful	2m 52s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - webservice_restful	3m 3s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - webservice_restful	2m 55s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - webservice_restful	3m 18s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - webservice_restful	3m 7s
ci / Release to the Moodle plugin directory	0s
	33m 41s

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