chore(deps): update dependency @ember/test-helpers to v4 #3445

Job	Run time
Tests (Floating Dependencies)	47s
Tests (ember-4.0, false)	36s
Lint Addon	32s
Tests (ember-lts-4.4, false)	30s
embroider-optimized - Allowed to fail	47s
Tests (ember-lts-4.8, false)	29s
Lint Test App	36s
ember-beta - Allowed to fail	34s
Tests (ember-4.12, false)	35s
ember-canary - Allowed to fail	40s
Tests (ember-lts-5.8, false)	35s
Tests (ember-default, false)	33s
Tests (ember-release, false)	42s
Tests (embroider-safe, false)	1m 21s
	9m 17s

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