Prepare for 4.5.6 release #734

Job	Run time
CI test (make validate)	1m 5s
Code coverage (codecov)	57s
Build moodle-plugin-ci.phar	35s
Integration tests (8.3, main, true)	6m 47s
Integration tests (8.3, MOODLE_405_STABLE, true)	6m 35s
Integration tests (8.3, MOODLE_404_STABLE, true)	6m 20s
Integration tests (8.2, MOODLE_403_STABLE, true)	6m 41s
Integration tests (8.2, MOODLE_402_STABLE, true)	6m 13s
Integration tests (8.1, MOODLE_401_STABLE, true)	6m 52s
Integration tests (8.0, MOODLE_400_STABLE)	5m 53s
Integration tests (8.0, MOODLE_311_STABLE)	5m 20s
Integration tests (7.4, MOODLE_39_STABLE)	4m 52s
SelfUpdate tests (PHAR) (8.3)	32s
Integration tests (PHAR) (8.3, main, true)	6m 8s
SelfUpdate tests (PHAR) (8.2)	41s
Integration tests (PHAR) (8.3, MOODLE_405_STABLE, true)	6m 1s
SelfUpdate tests (PHAR) (8.1)	19s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	6m 23s
SelfUpdate tests (PHAR) (8.0)	26s
SelfUpdate tests (PHAR) (7.4)	24s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	5m 46s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	5m 45s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	6m 31s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	4m 57s
	1h 42m 3s

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