CI/CD

Bump execa from 5.1.1 to 9.0.0 #1854

Job	Run time
Lint files	54s
Test addon (floating dependencies) (ember)	1m 21s
Test addon (locked dependencies) (ember)	1m 3s
Test addon (floating dependencies) (node)	1m 7s
Test addon (locked dependencies) (node)	46s
Test addon (floating dependencies) (test-apps)	1m 22s
Test addon (locked dependencies) (test-apps)	1m 4s
Test compatibility (ember-lts-4.4)	2m 35s
Test compatibility (ember-lts-4.8)	2m 33s
Test compatibility (ember-lts-4.12)	2m 43s
Test compatibility (ember-release)	2m 50s
Test compatibility (ember-beta)	2m 22s
Test compatibility (ember-canary)	2m 23s
Test compatibility (embroider-safe)	2m 39s
Deploy app	0s
	25m 42s

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