API Explicity mark nullable parameters for PHP 8.4 #631

Job	Run time
CI / Generate matrix	16s
CI / Context	1s
CI / 8.3 prf-low mariadb phpunit all	2m 5s
CI / Check governance	0s
CI / 8.3 mysql80 phpunit all	2m 34s
CI / 8.4 mysql84 phpunit all	2m 8s
CI / 8.3 mysql80 phplinting	2m 5s
CI / 8.3 mysql80 endtoend root job1	6m 28s
CI / 8.4 mysql84 endtoend root job1	6m 23s
CI / 8.3 mysql80 endtoend root job2	5m 14s
CI / 8.4 mysql84 endtoend root job2	5m 8s
CI / 8.3 mysql80 js	4m 22s
CI / Dispatch tag patch release	0s
	36m 44s

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