Prepare for 4.5.2 release #696

Job	Run time
CI test (make validate)	57s
Code coverage (codecov)	0s
Build moodle-plugin-ci.phar	35s
Integration tests (8.3, main)	6m 33s
Integration tests (8.3, MOODLE_404_STABLE)	6m 21s
Integration tests (8.2, MOODLE_403_STABLE)	6m 9s
Integration tests (8.2, MOODLE_402_STABLE)	6m 6s
Integration tests (8.1, MOODLE_401_STABLE)	6m 18s
Integration tests (8.0, MOODLE_400_STABLE)	6m 55s
Integration tests (8.0, MOODLE_311_STABLE)	5m 59s
Integration tests (7.4, MOODLE_39_STABLE)	5m 59s
SelfUpdate tests (PHAR) (8.3)	34s
Integration tests (PHAR) (8.3, main)	5m 52s
SelfUpdate tests (PHAR) (8.2)	30s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE)	6m 0s
SelfUpdate tests (PHAR) (8.1)	19s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE)	5m 34s
SelfUpdate tests (PHAR) (8.0)	37s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE)	5m 19s
SelfUpdate tests (PHAR) (7.4)	12s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	6m 8s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 40s
	1h 28m 37s

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