Bump js-yaml from 3.14.2 to 4.2.0

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 3.14.2 to 4.2.0.
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nodeca/js-yaml/compare/3.14.2...4.2.0)

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

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

package.json

@@ -181,7 +181,7 @@
     "jest-html-loader": "1.0.0",
     "jest-react-hooks-shallow": "1.5.1",
     "jest-trx-results-processor": "3.0.2",
-    "js-yaml": "3.14.2",
+    "js-yaml": "4.2.0",
     "less": "4.5.1",
     "less-loader": "11.1.3",
     "less-vars-loader": "1.1.0",