Bump execa from 5.1.1 to 9.2.0 #1860

Job	Run time
Lint files	52s
Test addon (locked dependencies) (ember)	1m 4s
Test addon (floating dependencies) (ember)	1m 26s
Test addon (locked dependencies) (node)	47s
Test compatibility (ember-lts-4.4)	2m 58s
Test addon (floating dependencies) (node)	1m 7s
Test addon (locked dependencies) (test-apps)	1m 5s
Test compatibility (ember-lts-4.8)	2m 53s
Test addon (floating dependencies) (test-apps)	1m 25s
Test compatibility (ember-lts-4.12)	2m 43s
Test compatibility (ember-release)	2m 38s
Test compatibility (ember-beta)	2m 20s
Test compatibility (ember-canary)	2m 25s
Test compatibility (embroider-safe)	2m 56s
Deploy app	0s
	26m 39s

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