Bump js-yaml from 4.1.1 to 4.2.0 in /ui/app (#3114)

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](https://github.com/nodeca/js-yaml/compare/4.1.1...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

ui/app/package.json

@@ -38,7 +38,7 @@
     "brfs": "^2.0.2",
     "dedent-js": "1.0.1",
     "eslint": "^8.32.0",
-    "js-yaml": "4.1.1",
+    "js-yaml": "4.2.0",
     "pug": "^3.0.2",
     "rimraf": "^4.1.2",
     "riot": "^3.13.2",