Bump handlebars from 4.1.5 to 4.1.6 (#554)

Bumps [handlebars](https://github.com/sunng87/handlebars-rust) from 4.1.5 to 4.1.6.
- [Release notes](https://github.com/sunng87/handlebars-rust/releases)
- [Changelog](https://github.com/sunng87/handlebars-rust/blob/master/CHANGELOG.md)
- [Commits](sunng87/handlebars-rust@v4.1.5...v4.1.6)

---
updated-dependencies:
- dependency-name: handlebars
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]