Build(deps-dev): Bump eslint-plugin-ember from 12.1.1 to 12.2.1

Bumps [eslint-plugin-ember](https://github.com/ember-cli/eslint-plugin-ember) from 12.1.1 to 12.2.1.
- [Release notes](https://github.com/ember-cli/eslint-plugin-ember/releases)
- [Changelog](https://github.com/ember-cli/eslint-plugin-ember/blob/master/CHANGELOG.md)
- [Commits](ember-cli/eslint-plugin-ember@v12.1.1...v12.2.1)

---
updated-dependencies:
- dependency-name: eslint-plugin-ember
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>