Prepare for 4.5.2 release #666

Job	Run time
Code coverage (codecov)	56s
CI test (make validate)	1m 1s
Build moodle-plugin-ci.phar	26s
Integration tests (8.3, main)	6m 37s
Integration tests (8.3, MOODLE_404_STABLE)	6m 12s
Integration tests (8.2, MOODLE_403_STABLE)	6m 2s
Integration tests (8.2, MOODLE_402_STABLE)	5m 56s
Integration tests (8.1, MOODLE_401_STABLE)	6m 29s
Integration tests (8.0, MOODLE_400_STABLE)	6m 19s
Integration tests (8.0, MOODLE_311_STABLE)	5m 43s
Integration tests (7.4, MOODLE_39_STABLE)	5m 39s
SelfUpdate tests (PHAR) (8.3)	36s
SelfUpdate tests (PHAR) (8.2)	34s
Integration tests (PHAR) (8.3, main)	5m 52s
SelfUpdate tests (PHAR) (8.1)	32s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE)	6m 13s
SelfUpdate tests (PHAR) (8.0)	25s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE)	5m 46s
SelfUpdate tests (PHAR) (7.4)	9s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE)	5m 30s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	5m 44s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 48s
	1h 28m 29s

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