Prepare for 4.5.3 release #702

Job	Run time
Code coverage (codecov)	0s
CI test (make validate)	56s
Build moodle-plugin-ci.phar	31s
Integration tests (8.3, main, true)	6m 35s
Integration tests (8.3, MOODLE_404_STABLE, true)	6m 25s
Integration tests (8.2, MOODLE_403_STABLE, true)	6m 23s
Integration tests (8.2, MOODLE_402_STABLE, true)	5m 58s
Integration tests (8.1, MOODLE_401_STABLE, true)	6m 36s
Integration tests (8.0, MOODLE_400_STABLE)	5m 54s
Integration tests (8.0, MOODLE_311_STABLE)	5m 11s
Integration tests (7.4, MOODLE_39_STABLE)	4m 49s
Integration tests (PHAR) (8.3, main, true)	6m 3s
SelfUpdate tests (PHAR) (8.3)	36s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	5m 52s
SelfUpdate tests (PHAR) (8.2)	31s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	5m 40s
SelfUpdate tests (PHAR) (8.1)	19s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	5m 41s
SelfUpdate tests (PHAR) (8.0)	30s
SelfUpdate tests (PHAR) (7.4)	12s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	6m 41s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 15s
	1h 26m 38s

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