bump version for rc2 #268

Job	Run time
test (8.1, MOODLE_401_STABLE, pgsql, false)	4m 6s
test (8.1, MOODLE_401_STABLE, mariadb, false)	4m 15s
test (8.1, MOODLE_402_STABLE, pgsql, false)	3m 33s
test (8.1, MOODLE_402_STABLE, mariadb, false)	3m 26s
test (8.1, MOODLE_403_STABLE, pgsql, false)	3m 53s
test (8.1, MOODLE_403_STABLE, mariadb, false)	4m 0s
test (8.1, MOODLE_404_STABLE, pgsql, false)	4m 12s
test (8.1, MOODLE_404_STABLE, mariadb, false)	4m 1s
test (8.2, MOODLE_402_STABLE, pgsql, false)	3m 33s
test (8.2, MOODLE_402_STABLE, mariadb, false)	3m 31s
test (8.2, MOODLE_403_STABLE, pgsql, false)	4m 0s
test (8.2, MOODLE_403_STABLE, mariadb, false)	3m 55s
test (8.2, MOODLE_404_STABLE, pgsql, false)	4m 10s
test (8.2, MOODLE_404_STABLE, mariadb, false)	4m 12s
test (8.3, MOODLE_404_STABLE, pgsql, false)	4m 11s
test (8.3, MOODLE_404_STABLE, mariadb, false)	4m 10s
test (8.3, main, mariadb, true)	4m 20s
	1h 7m 28s

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