Prepare for 4.5.3 release #678

Job	Run time
CI test (make validate)	54s
Code coverage (codecov)	55s
Build moodle-plugin-ci.phar	41s
Integration tests (8.3, main, true)	6m 23s
Integration tests (8.3, MOODLE_404_STABLE, true)	6m 45s
Integration tests (8.2, MOODLE_403_STABLE, true)	6m 13s
Integration tests (8.2, MOODLE_402_STABLE, true)	6m 23s
Integration tests (8.1, MOODLE_401_STABLE, true)	7m 16s
Integration tests (8.0, MOODLE_400_STABLE)	5m 33s
Integration tests (8.0, MOODLE_311_STABLE)	5m 23s
Integration tests (7.4, MOODLE_39_STABLE)	4m 59s
SelfUpdate tests (PHAR) (8.3)	35s
SelfUpdate tests (PHAR) (8.2)	37s
Integration tests (PHAR) (8.3, main, true)	6m 23s
SelfUpdate tests (PHAR) (8.1)	39s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	6m 4s
SelfUpdate tests (PHAR) (8.0)	25s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	5m 57s
SelfUpdate tests (PHAR) (7.4)	7s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	5m 34s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	6m 28s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	4m 52s
	1h 29m 6s

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