chore(deps): update dependency @ember/test-waiters to v2.4.4

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@ember/test-waiters	2.4.3 -> 2.4.4

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Release Notes

emberjs/ember-test-waiters

### [`v2.4.4`](https://togithub.com/emberjs/ember-test-waiters/blob/master/CHANGELOG.md#v244-2021-05-14) [Compare Source](https://togithub.com/emberjs/ember-test-waiters/compare/v2.4.3...v2.4.4) ##### :bug: Bug Fix - [#​254](https://togithub.com/emberjs/ember-test-waiters/pull/254) Flip the logic for deprecation of old package name ([@​scalvert](https://togithub.com/scalvert)) ##### Committers: 2 - Steve Calvert ([@​scalvert](https://togithub.com/scalvert)) - [@​dependabot-preview\[bot\]](https://togithub.com/apps/dependabot-preview)

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