Bump handlebars from 4.0.5 to 4.5.3 in /fixtures/ember-cli

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.0.5 to 4.5.3.
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/wycats/handlebars.js/blob/master/release-notes.md)
- [Commits](handlebars-lang/handlebars.js@v4.0.5...v4.5.3)

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

Author: dependabot[bot]