Bump js-yaml in /react-nginx

Bumps  and [js-yaml](https://github.com/nodeca/js-yaml). These dependencies needed to be updated together.

Updates `js-yaml` from 3.14.1 to 3.15.2
- [Changelog](https://github.com/nodeca/js-yaml/blob/3.15.2/CHANGELOG.md)
- [Commits](https://github.com/nodeca/js-yaml/compare/3.14.1...3.15.2)

Updates `js-yaml` from 4.1.0 to 4.3.2
- [Changelog](https://github.com/nodeca/js-yaml/blob/3.15.2/CHANGELOG.md)
- [Commits](https://github.com/nodeca/js-yaml/compare/3.14.1...3.15.2)

---
updated-dependencies:
- dependency-name: js-yaml
  dependency-version: 3.15.2
  dependency-type: indirect
- dependency-name: js-yaml
  dependency-version: 4.3.2
  dependency-type: indirect
...

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