Bump ember-exam from 1.0.0 to 4.0.9

Bumps [ember-exam](https://github.com/ember-cli/ember-exam) from 1.0.0 to 4.0.9.
- [Release notes](https://github.com/ember-cli/ember-exam/releases)
- [Changelog](https://github.com/ember-cli/ember-exam/blob/master/CHANGELOG.md)
- [Commits](ember-cli/ember-exam@v1.0.0...v4.0.9)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]