Prepare for 4.1.5 release #523

Job	Run time
CI test (make validate)	31s
Code coverage (codecov)	0s
Build moodle-plugin-ci.phar	38s
Integration tests (8.2, master)	6m 26s
Integration tests (8.2, MOODLE_402_STABLE)	6m 1s
Integration tests (8.1, MOODLE_401_STABLE)	7m 22s
Integration tests (8.0, MOODLE_400_STABLE)	6m 54s
Integration tests (8.0, MOODLE_311_STABLE)	7m 53s
Integration tests (7.4, MOODLE_310_STABLE)	5m 54s
Integration tests (7.4, MOODLE_39_STABLE)	5m 43s
Integration tests (7.4, MOODLE_38_STABLE)	5m 58s
Integration tests (PHAR) (8.2, master)	6m 38s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE)	7m 38s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	8m 59s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	6m 7s
	1h 22m 42s

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