API Explicity mark nullable parameters for PHP 8.4 #811

Job	Run time
CI / Context	1s
CI / Generate matrix	12s
CI / Check governance	0s
CI / 8.3 prf-low mariadb phpunit all	3m 33s
CI / 8.3 mysql80 phpunit all	4m 24s
CI / 8.4 mysql84 phpunit all	4m 0s
CI / 8.3 mysql80 phplinting	1m 41s
CI / 8.3 mysql80 endtoend root	5m 11s
CI / 8.4 mysql84 endtoend root	5m 29s
CI / 8.3 mysql80 js	3m 32s
CI / 8.3 mysql80 doclinting	2m 11s
CI / Dispatch tag patch release	0s
	30m 14s

Provide feedback