Update to Postgres 14 as required by main #723

Job	Run time
CI test (make validate)	1m 1s
Code coverage (codecov)	53s
Build moodle-plugin-ci.phar	24s
Integration tests (8.3, main, true)	1m 39s
Integration tests (8.3, MOODLE_405_STABLE, true)	7m 0s
Integration tests (8.3, MOODLE_404_STABLE, true)	6m 48s
Integration tests (8.2, MOODLE_403_STABLE, true)	6m 1s
Integration tests (8.2, MOODLE_402_STABLE, true)	6m 21s
Integration tests (8.1, MOODLE_401_STABLE, true)	7m 1s
Integration tests (8.0, MOODLE_400_STABLE)	5m 32s
Integration tests (8.0, MOODLE_311_STABLE)	5m 7s
Integration tests (7.4, MOODLE_39_STABLE)	4m 52s
SelfUpdate tests (PHAR) (8.3)	31s
SelfUpdate tests (PHAR) (8.2)	33s
Integration tests (PHAR) (8.3, main, true)	1m 51s
Integration tests (PHAR) (8.3, MOODLE_405_STABLE, true)	6m 9s
SelfUpdate tests (PHAR) (8.1)	20s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	5m 54s
SelfUpdate tests (PHAR) (8.0)	26s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	5m 57s
SelfUpdate tests (PHAR) (7.4)	8s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	5m 43s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	6m 9s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 9s
	1h 31m 29s

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