Bump php dependencies (and other minor tweaks) #726

Job	Run time
Code coverage (codecov)	55s
CI test (make validate)	56s
Integration tests (8.3, main, true)	6m 34s
Build moodle-plugin-ci.phar	28s
Integration tests (8.3, MOODLE_405_STABLE, true)	6m 47s
Integration tests (8.3, MOODLE_404_STABLE, true)	6m 55s
Integration tests (8.2, MOODLE_403_STABLE, true)	6m 17s
Integration tests (8.2, MOODLE_402_STABLE, true)	6m 20s
Integration tests (8.1, MOODLE_401_STABLE, true)	6m 53s
Integration tests (8.0, MOODLE_400_STABLE)	5m 39s
Integration tests (8.0, MOODLE_311_STABLE)	5m 7s
Integration tests (7.4, MOODLE_39_STABLE)	4m 49s
Integration tests (PHAR) (8.3, main, true)	6m 1s
SelfUpdate tests (PHAR) (8.3)	38s
Integration tests (PHAR) (8.3, MOODLE_405_STABLE, true)	6m 7s
SelfUpdate tests (PHAR) (8.2)	40s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	6m 12s
SelfUpdate tests (PHAR) (8.1)	19s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	6m 4s
SelfUpdate tests (PHAR) (8.0)	27s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	5m 58s
SelfUpdate tests (PHAR) (7.4)	8s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	6m 16s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	4m 59s
	1h 41m 29s

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