Bump cross-spawn from 7.0.3 to 7.0.6 #618

Job	Run time
CI / Generate matrix	16s
CI / Context	1s
CI / Check governance	0s
CI / 8.1 prf-low mysql57 phpunit all	2m 28s
CI / 8.2 mariadb phpunit all	2m 29s
CI / 8.3 mysql80 phpunit all	2m 23s
CI / 8.3 mysql84 phpunit all	2m 7s
CI / 8.1 mysql57 phplinting	2m 8s
CI / 8.1 mysql57 endtoend root job1	6m 24s
CI / 8.3 mysql80 endtoend root job1	6m 42s
CI / 8.1 mysql57 endtoend root job2	5m 22s
CI / 8.3 mysql80 endtoend root job2	5m 18s
CI / 8.1 mysql57 js	5m 27s
CI / Dispatch tag patch release	0s
	41m 5s

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