API Explicity mark nullable parameters for PHP 8.4 #705

Job	Run time
ci / Generate matrix	19s
ci / Context	1s
ci / Check governance	0s
ci / 8.3 prf-low mariadb phpunit all	2m 59s
ci / 8.3 mysql80 phpunit all	3m 45s
ci / 8.4 mysql84 phpunit all	4m 4s
ci / 8.3 mysql80 phplinting	1m 46s
ci / 8.3 mysql80 endtoend root job1	6m 18s
ci / 8.4 mysql84 endtoend root job1	6m 12s
ci / 8.3 mysql80 endtoend root job2	7m 54s
ci / 8.4 mysql84 endtoend root job2	11m 2s
ci / 8.3 mysql80 js	4m 40s
ci / 8.3 mysql80 doclinting	2m 30s
ci / Dispatch tag patch release	0s
	51m 30s

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