Bump cross-spawn from 7.0.3 to 7.0.6 #563

Job	Run time
CI / Generate matrix	20s
CI / Context	1s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit all	2m 39s
CI / 8.2 mariadb phpunit all	2m 37s
CI / 8.3 mysql80 phpunit all	2m 21s
CI / 8.3 mysql84 phpunit all	2m 27s
CI / 8.1 mysql57 phplinting	1m 44s
CI / 8.1 mysql57 endtoend root	3m 6s
CI / 8.3 mysql80 endtoend root	3m 29s
CI / 8.1 mysql57 js	5m 9s
CI / 8.1 mysql57 doclinting	2m 14s
CI / Dispatch tag patch release	1s
	26m 9s

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