add experimental support for new moodle release 4.4 with php 8.3 #230

Job	Run time
test (8.1, MOODLE_401_STABLE, pgsql, false)	4m 0s
test (8.1, MOODLE_401_STABLE, mariadb, false)	3m 41s
test (8.1, MOODLE_402_STABLE, pgsql, false)	3m 8s
test (8.1, MOODLE_402_STABLE, mariadb, false)	3m 15s
test (8.1, MOODLE_403_STABLE, pgsql, false)	3m 32s
test (8.1, MOODLE_403_STABLE, mariadb, false)	3m 39s
test (8.2, MOODLE_402_STABLE, pgsql, false)	3m 4s
test (8.2, MOODLE_402_STABLE, mariadb, false)	3m 10s
test (8.2, MOODLE_403_STABLE, pgsql, false)	3m 29s
test (8.2, MOODLE_403_STABLE, mariadb, false)	3m 29s
test (8.3, MOODLE_404_STABLE, mariadb, true)	3m 26s
test (8.3, MOODLE_404_STABLE, pgsql, true)	3m 38s
	41m 31s

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