Bump backbone from 1.4.0 to 1.4.1

Bumps [backbone](https://github.com/jashkenas/backbone) from 1.4.0 to 1.4.1.
- [Release notes](https://github.com/jashkenas/backbone/releases)
- [Commits](https://github.com/jashkenas/backbone/compare/1.4.0...1.4.1

)

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

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