Use nvm 0.39.7. #128

Job	Run time
CI test (make validate)	1m 1s
Code coverage (codecov)	0s
Build moodle-plugin-ci.phar	29s
Integration tests (8.3, main, true)	6m 49s
Integration tests (8.3, MOODLE_404_STABLE, true)	6m 42s
Integration tests (8.2, MOODLE_403_STABLE, true)	6m 14s
Integration tests (8.2, MOODLE_402_STABLE, true)	6m 41s
Integration tests (8.1, MOODLE_401_STABLE, true)	7m 5s
Integration tests (8.0, MOODLE_400_STABLE)	6m 22s
Integration tests (8.0, MOODLE_311_STABLE)	5m 32s
Integration tests (7.4, MOODLE_39_STABLE)	5m 35s
SelfUpdate tests (PHAR) (8.3)	35s
Integration tests (PHAR) (8.3, main, true)	6m 10s
SelfUpdate tests (PHAR) (8.2)	35s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	6m 14s
SelfUpdate tests (PHAR) (8.1)	19s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	6m 8s
SelfUpdate tests (PHAR) (8.0)	22s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	5m 45s
SelfUpdate tests (PHAR) (7.4)	14s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	6m 29s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 5s
	1h 30m 26s

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