Bump cross-spawn from 7.0.3 to 7.0.6 (#1351) #813

Job	Run time
CI / Generate matrix	12s
CI / Context	1s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit all	3m 38s
CI / 8.2 mariadb phpunit all	3m 27s
CI / 8.3 mysql80 phpunit all	4m 22s
CI / 8.3 mysql84 phpunit all	4m 8s
CI / 8.1 mysql57 phplinting	1m 52s
CI / 8.1 mysql57 endtoend root	5m 17s
CI / 8.3 mysql80 endtoend root	5m 25s
CI / 8.1 mysql57 js	3m 46s
CI / 8.1 mysql57 doclinting	2m 22s
CI / Dispatch tag patch release	2s
	34m 33s

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