Bump cross-spawn from 7.0.3 to 7.0.6 #799

Job	Run time
CI / Generate matrix	15s
CI / Context	1s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit all	4m 5s
CI / 8.2 mariadb phpunit all	1m 9s
CI / 8.3 mysql80 phpunit all	1m 11s
CI / 8.3 mysql84 phpunit all	1m 30s
CI / 8.1 mysql57 phplinting	1m 29s
CI / 8.1 mysql57 endtoend root	1m 56s
CI / 8.3 mysql80 endtoend root	2m 7s
CI / 8.1 mysql57 js	1m 28s
CI / 8.1 mysql57 doclinting	1m 14s
CI / Dispatch tag patch release	0s
	16m 26s

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