Bump version for v4.5-r1 #420

Job	Run time
call / setup_jobs	5s
call / static (8.3, MOODLE_405_STABLE, pgsql)	1m 18s
call / test (7.4, MOODLE_401_STABLE, pgsql)	8m 18s
call / test (8.1, MOODLE_401_STABLE, pgsql)	8m 0s
call / test (8.0, MOODLE_402_STABLE, pgsql)	7m 28s
call / test (8.2, MOODLE_402_STABLE, pgsql)	7m 31s
call / test (8.0, MOODLE_403_STABLE, pgsql)	7m 27s
call / test (8.2, MOODLE_403_STABLE, pgsql)	7m 37s
call / test (8.1, MOODLE_404_STABLE, pgsql)	8m 1s
call / test (8.3, MOODLE_404_STABLE, pgsql)	7m 43s
call / test (8.1, MOODLE_405_STABLE, pgsql)	8m 2s
call / test (8.2, MOODLE_405_STABLE, pgsql)	8m 10s
call / test (8.3, MOODLE_405_STABLE, pgsql)	7m 58s
call / test (8.3, MOODLE_405_STABLE, mariadb)	7m 47s
call / test (8.3, MOODLE_405_STABLE, mysqli)	8m 38s
	1h 44m 3s

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