Prepare for 4.5.3 release #677

Job	Run time
Code coverage (codecov)	54s
CI test (make validate)	57s
Build moodle-plugin-ci.phar	27s
Integration tests (8.3, main, true)	6m 30s
Integration tests (8.3, MOODLE_404_STABLE, true)	6m 21s
Integration tests (8.2, MOODLE_403_STABLE, true)	6m 27s
Integration tests (8.2, MOODLE_402_STABLE, true)	5m 57s
Integration tests (8.1, MOODLE_401_STABLE, true)	7m 16s
Integration tests (8.0, MOODLE_400_STABLE)	5m 34s
Integration tests (8.0, MOODLE_311_STABLE)	5m 41s
Integration tests (7.4, MOODLE_39_STABLE)	4m 53s
SelfUpdate tests (PHAR) (8.3)	33s
SelfUpdate tests (PHAR) (8.2)	30s
Integration tests (PHAR) (8.3, main, true)	6m 10s
SelfUpdate tests (PHAR) (8.1)	23s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	5m 57s
SelfUpdate tests (PHAR) (8.0)	28s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	6m 0s
SelfUpdate tests (PHAR) (7.4)	10s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	5m 39s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	6m 30s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	4m 50s
	1h 28m 7s

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