Bump @ember/test-waiters from 3.1.0 to 4.0.0 (#154)

Bumps [@ember/test-waiters](https://github.com/emberjs/ember-test-waiters) from 3.1.0 to 4.0.0.
- [Release notes](https://github.com/emberjs/ember-test-waiters/releases)
- [Changelog](https://github.com/emberjs/ember-test-waiters/blob/master/CHANGELOG.md)
- [Commits](https://github.com/emberjs/ember-test-waiters/commits)

---
updated-dependencies:
- dependency-name: "@ember/test-waiters"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pnpm-lock.yaml

@@ -7,7 +7,7 @@
     "types": "tsc --noEmit"
   },
   "devDependencies": {
-    "@ember/test-waiters": "^3.1.0",
+    "@ember/test-waiters": "^4.0.0",
     "@glimmer/component": "^2.0.0",
     "@glimmer/tracking": "^1.1.2",
     "@glint/template": "^1.3.0",