Bump ember-cli-htmlbars from 4.0.6 to 4.0.8
Bump ember-cli-htmlbars from 4.0.6 to 4.0.8

Bumps [ember-cli-htmlbars](https://github.com/ember-cli/ember-cli-htmlbars) from 4.0.6 to 4.0.8.
- [Release notes](https://github.com/ember-cli/ember-cli-htmlbars/releases)
- [Changelog](https://github.com/ember-cli/ember-cli-htmlbars/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ember-cli/ember-cli-htmlbars/compare/v4.0.6...v4.0.8)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
freshbooks/initials-avatar,freshbooks/initials-avatar