Bump cross-spawn from 7.0.3 to 7.0.6 #564

Job	Run time
CI / Generate matrix	20s
CI / Context	1s
CI / Check governance	0s
CI / 8.1 prf-low mysql57 phpunit all	2m 13s
CI / 8.2 mariadb phpunit all	2m 41s
CI / 8.3 mysql80 phpunit all	2m 48s
CI / 8.3 mysql84 phpunit all	2m 23s
CI / 8.1 mysql57 phplinting	1m 43s
CI / 8.1 mysql57 endtoend root	2m 47s
CI / 8.3 mysql80 endtoend root	2m 54s
CI / 8.1 mysql57 js	4m 25s
CI / 8.1 mysql57 doclinting	2m 20s
CI / Dispatch tag patch release	0s
	24m 35s

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