Bump js-yaml from 4.1.1 to 4.2.0

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 4.1.1 to 4.2.0.
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](nodeca/js-yaml@4.1.1...4.2.0)

---
updated-dependencies:
- dependency-name: js-yaml
  dependency-version: 4.2.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]