[dependency]: bump sinon-chai in /faucet/authenticator

Bumps [sinon-chai](https://github.com/chaijs/sinon-chai) from 3.7.0 to 4.0.1.
- [Release notes](https://github.com/chaijs/sinon-chai/releases)
- [Changelog](https://github.com/chaijs/sinon-chai/blob/master/CHANGELOG.md)
- [Commits](chaijs/sinon-chai@3.7.0...4.0.1)

---
updated-dependencies:
- dependency-name: sinon-chai
  dependency-version: 4.0.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]