Bump cross-spawn from 7.0.3 to 7.0.6 #435

Job	Run time
CI / Context	1s
CI / Generate matrix	18s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit all	1m 48s
CI / 8.2 mariadb phpunit all	1m 30s
CI / 8.3 mysql80 phpunit all	1m 40s
CI / 8.3 mysql84 phpunit all	1m 33s
CI / 8.1 mysql57 phplinting	1m 19s
CI / 8.1 mysql57 endtoend root	1m 57s
CI / 8.3 mysql80 endtoend root	2m 10s
CI / 8.1 mysql57 js	1m 17s
CI / Dispatch tag patch release	0s
	13m 34s

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