CI/CD

Bump execa from 5.1.1 to 9.4.0 #1889

Job	Run time
Lint files	3m 11s
Test addon (floating dependencies) (ember)	1m 23s
Test addon (locked dependencies) (ember)	59s
Test addon (floating dependencies) (node)	1m 5s
Test compatibility (ember-lts-4.4)	2m 25s
Test addon (locked dependencies) (node)	43s
Test compatibility (ember-lts-4.8)	2m 25s
Test addon (floating dependencies) (test-apps)	1m 15s
Test addon (locked dependencies) (test-apps)	58s
Test compatibility (ember-lts-4.12)	2m 50s
Test compatibility (ember-release)	2m 15s
Test compatibility (ember-beta)	2m 24s
Test compatibility (ember-canary)	2m 31s
Test compatibility (embroider-safe)	2m 31s
Deploy app	0s
	26m 55s

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