API Explicity mark nullable parameters for PHP 8.4 #628

Job	Run time
CI / Context	1s
CI / Generate matrix	15s
CI / Check governance	0s
CI / 8.3 prf-low mariadb phpunit all	2m 30s
CI / 8.3 mysql80 phpunit all	2m 10s
CI / 8.4 mysql84 phpunit all	2m 16s
CI / 8.3 mysql80 phplinting	1m 42s
CI / 8.3 mysql80 endtoend root job1	5m 55s
CI / 8.4 mysql84 endtoend root job1	6m 35s
CI / 8.3 mysql80 endtoend root job2	5m 18s
CI / 8.4 mysql84 endtoend root job2	5m 20s
CI / 8.3 mysql80 js	4m 17s
CI / Dispatch tag patch release	0s
	36m 19s

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