build(deps): bump ember-cli-htmlbars from 5.6.2 to 5.7.1

Bumps [ember-cli-htmlbars](https://github.com/ember-cli/ember-cli-htmlbars) from 5.6.2 to 5.7.1.
- [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](ember-cli/ember-cli-htmlbars@v5.6.2...v5.7.1)

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