API Explicity mark nullable parameters for PHP 8.4 #635

Job	Run time
CI / Generate matrix	13s
CI / Context	1s
CI / Check governance	0s
CI / 8.3 prf-low mariadb phpunit all	3m 21s
CI / 8.3 mysql80 phpunit all	3m 52s
CI / 8.3 mysql84 phpunit all	3m 47s
CI / 8.3 mysql80 phplinting	2m 19s
CI / 8.3 mysql80 endtoend asset-admin	19m 52s
CI / 8.3 mysql80 endtoend versioned-admin	10m 2s
CI / 8.3 mysql80 endtoend silverstripe-elemental	45m 54s
CI / Dispatch tag patch release	0s
	1h 29m 21s

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