Bump handlebars and hbs

Bumps [handlebars](https://github.com/wycats/handlebars.js) and [hbs](https://github.com/pillarjs/hbs). These dependencies needed to be updated together.

Updates `handlebars` from 4.1.2 to 4.7.7
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/handlebars-lang/handlebars.js/blob/master/release-notes.md)
- [Commits](handlebars-lang/handlebars.js@v4.1.2...v4.7.7)

Updates `hbs` from 4.0.4 to 4.2.0
- [Release notes](https://github.com/pillarjs/hbs/releases)
- [Changelog](https://github.com/pillarjs/hbs/blob/master/HISTORY.md)
- [Commits](pillarjs/hbs@v4.0.4...v4.2.0)

---
updated-dependencies:
- dependency-name: handlebars
  dependency-type: indirect
- dependency-name: hbs
  dependency-type: indirect
...

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

Author: dependabot[bot]