MNT Resolve deprecation warning in test #629

Job	Run time
ci / Generate matrix	25s
ci / Context	1s
ci / 8.1 prf-low mysql57 phpunit all	1m 30s
ci / 8.2 mariadb phpunit all	1m 29s
ci / 8.3 mysql80 phpunit all	1m 24s
ci / Check governance	0s
ci / 8.1 mysql57 phplinting	1m 7s
ci / 8.1 mysql57 endtoend root job1	1m 47s
ci / 8.3 mysql80 endtoend root job1	2m 18s
ci / 8.1 mysql57 endtoend root job2	2m 41s
ci / 8.3 mysql80 endtoend root job2	3m 2s
ci / 8.1 mysql57 js	1m 5s
ci / 8.1 mysql57 doclinting	1m 18s
ci / Dispatch tag patch release	0s
	18m 7s

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