Bump execa from 5.1.1 to 9.5.1 #1900

Job	Run time
Lint files	3m 10s
Test addon (floating dependencies) (ember)	1m 9s
Test addon (locked dependencies) (ember)	1m 2s
Test compatibility (ember-lts-4.4)	7m 13s
Test addon (floating dependencies) (node)	1m 5s
Test addon (locked dependencies) (node)	47s
Test compatibility (ember-lts-4.8)	7m 14s
Test addon (floating dependencies) (test-apps)	1m 10s
Test addon (locked dependencies) (test-apps)	1m 0s
Test compatibility (ember-lts-4.12)	2m 32s
Test compatibility (ember-release)	2m 15s
Test compatibility (ember-beta)	2m 16s
Test compatibility (ember-canary)	2m 14s
Test compatibility (embroider-safe)	2m 32s
Deploy app	0s
	35m 39s

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