Update dependency @ember/test-helpers to v2.9.4

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@ember/test-helpers	2.9.3 -> 2.9.4

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Release Notes

emberjs/ember-test-helpers (@​ember/test-helpers)

v2.9.4: Release 2.9.4

Compare Source

:bug: Bug Fix

• #​1418 (backport) bugfix: handle null and undefined in setProperties (@​chriskrycho)

Committers: 1

• Chris Krycho (@​chriskrycho)

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