chore(deps): update dependency @ember/test-helpers to v3.3.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@ember/test-helpers	3.3.0 -> 3.3.1

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Latest commit: 78b5232cfad64cd98a6fe45b8284206c60cef322

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