chore(deps-dev): bump dtslint from 4.2.0 to 4.2.1 (#2263)

Bumps [dtslint](https://github.com/Microsoft/dtslint) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/Microsoft/dtslint/releases)
- [Commits](https://github.com/Microsoft/dtslint/commits)

---
updated-dependencies:
- dependency-name: dtslint
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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