Update dependency ember-cli to v4.9.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-cli (source)	4.9.0 -> 4.9.1

---

Release Notes

ember-cli/ember-cli

### [`v4.9.1`](https://togithub.com/ember-cli/ember-cli/blob/HEAD/CHANGELOG.md#v491) [Compare Source](https://togithub.com/ember-cli/ember-cli/compare/v4.9.0...v4.9.1) ##### Blueprint Changes - [`ember new` diff](https://togithub.com/ember-cli/ember-new-output/compare/v4.9.0...v4.9.1) - [`ember addon` diff](https://togithub.com/ember-cli/ember-addon-output/compare/v4.9.0...v4.9.1) ##### Changelog - [#​10101](https://togithub.com/ember-cli/ember-cli/pull/10101) \[BUGFIX release] Correctly instantiate `Watcher` instance when running `ember test --serve` [@​bertdeblock](https://togithub.com/bertdeblock) Thank you to all who took the time to contribute!

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.