Prepare for 4.4.0 release #593

Job	Run time
SelfUpdate tests (PHAR) (8.2)	21s
CI test (make validate)	1m 0s
SelfUpdate tests (PHAR) (8.1)	17s
SelfUpdate tests (PHAR) (8.0)	21s
Code coverage (codecov)	1m 6s
SelfUpdate tests (PHAR) (7.4)	8s
Build moodle-plugin-ci.phar	30s
Integration tests (8.3, main)	6m 23s
Integration tests (8.2, MOODLE_403_STABLE)	6m 10s
Integration tests (8.2, MOODLE_402_STABLE)	6m 2s
Integration tests (8.1, MOODLE_401_STABLE)	6m 46s
Integration tests (8.0, MOODLE_400_STABLE)	6m 54s
Integration tests (8.0, MOODLE_311_STABLE)	5m 50s
Integration tests (7.4, MOODLE_39_STABLE)	5m 46s
Integration tests (PHAR) (8.3, main)	5m 51s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE)	5m 41s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE)	5m 17s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	6m 15s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 45s
	1h 16m 23s

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