refactor list of compatible moodle and php versions to a separate mac… #305

Job	Run time
define-matrix	3s
test (8.3, main, pgsql, true)	3m 38s
test (8.3, main, mariadb, true)	3m 36s
test (8.1, MOODLE_404_STABLE, pgsql, false)	3m 21s
test (8.1, MOODLE_404_STABLE, mariadb, false)	3m 26s
test (8.2, MOODLE_404_STABLE, pgsql, false)	3m 15s
test (8.2, MOODLE_404_STABLE, mariadb, false)	3m 18s
test (8.3, MOODLE_404_STABLE, pgsql, false)	3m 25s
test (8.3, MOODLE_404_STABLE, mariadb, false)	3m 22s
test (8.1, MOODLE_405_STABLE, pgsql, false)	3m 20s
test (8.1, MOODLE_405_STABLE, mariadb, false)	3m 23s
test (8.2, MOODLE_405_STABLE, pgsql, false)	3m 41s
test (8.2, MOODLE_405_STABLE, mariadb, false)	3m 27s
test (8.3, MOODLE_405_STABLE, pgsql, false)	3m 44s
test (8.3, MOODLE_405_STABLE, mariadb, false)	3m 41s
	48m 40s

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