Update dependency @ember/test-helpers to ^2.9.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@ember/test-helpers	^2.9.1 -> ^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 Fix

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

Committers: 1

• Chris Krycho (@​chriskrycho)

v2.9.3: Release 2.9.3

Compare Source

🐛 Bug Fix

• #​1305 [backport] Avoid unnecessary dependencies on @glimmer types (@​dfreeman)

Committers: 1

• Dan Freeman (@​dfreeman)

v2.9.2: Release 2.9.2

Compare Source

🐛 Bug Fix

• #​1302 [backport] Remove the index signature from TestContext (@​chriskrycho)
  • Backporting #​1301 Remove the index signature from TestContext (@​dfreeman)
• #​1303 TestContext.resumeTest() returns void, not Promise<void> (@​chriskrycho)

Committers: 1

• Chris Krycho (@​chriskrycho)
• Dan Freeman (@​dfreeman)

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