⬆️ Bump ember-cli-mirage from 2.1.0 to 2.4.0 (#522)

Bumps [ember-cli-mirage](https://github.com/miragejs/ember-cli-mirage) from 2.1.0 to 2.4.0.
- [Release notes](https://github.com/miragejs/ember-cli-mirage/releases)
- [Changelog](https://github.com/miragejs/ember-cli-mirage/blob/master/CHANGELOG.md)
- [Commits](miragejs/ember-cli-mirage@v2.1.0...v2.4.0)

---
updated-dependencies:
- dependency-name: ember-cli-mirage
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]