supported moodle versions are now only 4.4 and 4.5 #271

Job	Run time
test (8.1, MOODLE_404_STABLE, pgsql, false)	3m 42s
test (8.1, MOODLE_404_STABLE, mariadb, false)	3m 43s
test (8.1, MOODLE_405_STABLE, pgsql, false)	4m 3s
test (8.1, MOODLE_405_STABLE, mariadb, false)	3m 52s
test (8.2, MOODLE_404_STABLE, pgsql, false)	3m 50s
test (8.2, MOODLE_404_STABLE, mariadb, false)	3m 52s
test (8.2, MOODLE_405_STABLE, pgsql, false)	4m 2s
test (8.2, MOODLE_405_STABLE, mariadb, false)	4m 9s
test (8.3, MOODLE_404_STABLE, pgsql, false)	4m 7s
test (8.3, MOODLE_404_STABLE, mariadb, false)	3m 34s
test (8.3, MOODLE_405_STABLE, pgsql, false)	3m 55s
test (8.3, MOODLE_405_STABLE, mariadb, false)	3m 46s
test (8.3, main, mariadb, true)	3m 49s
	50m 24s

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