Bump cross-spawn from 7.0.3 to 7.0.6 #582

Job	Run time
CI / Context	1s
CI / Generate matrix	22s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit blog	2m 16s
CI / 8.2 mariadb phpunit blog	1m 16s
CI / 8.3 mysql80 phpunit blog	1m 20s
CI / 8.3 mysql84 phpunit blog	1m 33s
CI / 8.1 mysql57 phplinting	1m 35s
CI / 8.1 mysql57 endtoend root	2m 17s
CI / 8.3 mysql80 endtoend root	2m 32s
CI / 8.1 mysql57 js	1m 20s
CI / Dispatch tag patch release	0s
	14m 33s

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