Bump cross-spawn from 7.0.3 to 7.0.6 (#615) #636

Job	Run time
CI / Context	1s
CI / Generate matrix	11s
CI / 8.1 prf-low mysql57 phpunit all	3m 21s
CI / Check governance	1s
CI / 8.2 mariadb phpunit all	3m 26s
CI / 8.3 mysql80 phpunit all	3m 35s
CI / 8.3 mysql84 phpunit all	3m 37s
CI / 8.1 mysql57 phplinting	1m 38s
CI / 8.1 mysql57 endtoend root	4m 29s
CI / 8.3 mysql80 endtoend root	5m 2s
CI / 8.1 mysql57 js	3m 45s
CI / Dispatch tag patch release	3s
	29m 9s

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