Prepare for 4.5.3 release #703

Job	Run time
Code coverage (codecov)	0s
CI test (make validate)	55s
Build moodle-plugin-ci.phar	32s
Integration tests (8.3, main, true)	6m 32s
Integration tests (8.3, MOODLE_404_STABLE, true)	6m 28s
Integration tests (8.2, MOODLE_403_STABLE, true)	6m 29s
Integration tests (8.2, MOODLE_402_STABLE, true)	6m 3s
Integration tests (8.1, MOODLE_401_STABLE, true)	1s
Integration tests (8.0, MOODLE_400_STABLE)	5m 39s
Integration tests (8.0, MOODLE_311_STABLE)	5m 1s
Integration tests (7.4, MOODLE_39_STABLE)	4m 55s
SelfUpdate tests (PHAR) (8.3)	47s
SelfUpdate tests (PHAR) (8.2)	35s
Integration tests (PHAR) (8.3, main, true)	5m 51s
SelfUpdate tests (PHAR) (8.1)	57s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	6m 10s
SelfUpdate tests (PHAR) (8.0)	21s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	6m 23s
SelfUpdate tests (PHAR) (7.4)	14s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	5m 40s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	6m 14s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 0s
	1h 20m 47s

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