Prepare for 4.5.2 release #667

Job	Run time
CI test (make validate)	59s
Code coverage (codecov)	55s
Build moodle-plugin-ci.phar	28s
Integration tests (8.3, main)	6m 17s
Integration tests (8.3, MOODLE_404_STABLE)	6m 15s
Integration tests (8.2, MOODLE_403_STABLE)	6m 1s
Integration tests (8.2, MOODLE_402_STABLE)	5m 52s
Integration tests (8.1, MOODLE_401_STABLE)	6m 42s
Integration tests (8.0, MOODLE_400_STABLE)	6m 38s
Integration tests (8.0, MOODLE_311_STABLE)	6m 21s
Integration tests (7.4, MOODLE_39_STABLE)	5m 54s
Integration tests (PHAR) (8.3, main)	5m 55s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE)	5m 49s
SelfUpdate tests (PHAR) (8.3)	32s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE)	5m 34s
SelfUpdate tests (PHAR) (8.2)	37s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE)	5m 24s
SelfUpdate tests (PHAR) (8.1)	20s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	5m 51s
SelfUpdate tests (PHAR) (8.0)	34s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 42s
SelfUpdate tests (PHAR) (7.4)	14s
	1h 28m 54s

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