chore(deps-dev): bump @ember/optional-features from 2.0.0 to 2.1.0

Bumps [@ember/optional-features](https://github.com/emberjs/ember-optional-features) from 2.0.0 to 2.1.0.
- [Release notes](https://github.com/emberjs/ember-optional-features/releases)
- [Changelog](https://github.com/emberjs/ember-optional-features/blob/master/CHANGELOG.md)
- [Commits](https://github.com/emberjs/ember-optional-features/commits)

---
updated-dependencies:
- dependency-name: "@ember/optional-features"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]