MNT Ignore phpstan error we can't fix (#1316) #682

Job	Run time
CI / Context	1s
CI / Generate matrix	15s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit all	3m 20s
CI / 8.2 mariadb phpunit all	3m 37s
CI / 8.3 mysql80 phpunit all	4m 39s
CI / 8.1 mysql57 phplinting	1m 58s
CI / 8.1 mysql57 endtoend root	4m 30s
CI / 8.3 mysql80 endtoend root	5m 33s
CI / 8.1 mysql57 js	3m 51s
CI / 8.1 mysql57 doclinting	2m 4s
CI / Dispatch tag patch release	4s
	29m 53s

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