Prepare for 4.5.5 release #717

Job	Run time
Code coverage (codecov)	1m 2s
CI test (make validate)	1m 4s
Integration tests (8.3, main, true)	6m 37s
Build moodle-plugin-ci.phar	34s
Integration tests (8.3, MOODLE_405_STABLE, true)	6m 43s
Integration tests (8.3, MOODLE_404_STABLE, true)	6m 22s
Integration tests (8.2, MOODLE_403_STABLE, true)	6m 8s
Integration tests (8.2, MOODLE_402_STABLE, true)	5m 58s
Integration tests (8.1, MOODLE_401_STABLE, true)	6m 57s
Integration tests (8.0, MOODLE_400_STABLE)	5m 40s
Integration tests (8.0, MOODLE_311_STABLE)	5m 8s
Integration tests (7.4, MOODLE_39_STABLE)	5m 5s
Integration tests (PHAR) (8.3, main, true)	6m 16s
SelfUpdate tests (PHAR) (8.3)	34s
Integration tests (PHAR) (8.3, MOODLE_405_STABLE, true)	5m 56s
SelfUpdate tests (PHAR) (8.2)	37s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	5m 54s
SelfUpdate tests (PHAR) (8.1)	20s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	5m 58s
SelfUpdate tests (PHAR) (8.0)	23s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	6m 7s
SelfUpdate tests (PHAR) (7.4)	8s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	6m 22s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 7s
	1h 41m 0s

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