Prepare for 4.3.1 release #552

Job	Run time
Code coverage (codecov)	25s
CI test (make validate)	28s
Build moodle-plugin-ci.phar	33s
Integration tests (8.2, main)	6m 7s
Integration tests (8.2, MOODLE_403_STABLE)	6m 1s
Integration tests (8.2, MOODLE_402_STABLE)	5m 54s
Integration tests (8.1, MOODLE_401_STABLE)	7m 7s
Integration tests (8.0, MOODLE_400_STABLE)	6m 35s
Integration tests (8.0, MOODLE_311_STABLE)	5m 52s
Integration tests (7.4, MOODLE_39_STABLE)	5m 55s
Integration tests (PHAR) (8.2, main)	6m 6s
Integration tests (PHAR) (8.1, MOODLE_403_STABLE)	5m 34s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	6m 45s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 50s
	1h 9m 12s

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