Bump the npm_and_yarn group across 1 directory with 2 updates

Bumps the npm_and_yarn group with 2 updates in the /frontend directory: [next](https://github.com/vercel/next.js) and [js-yaml](https://github.com/nodeca/js-yaml).


Updates `next` from 15.4.1 to 15.5.6
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.4.1...v15.5.6)

Updates `js-yaml` from 4.1.0 to 4.1.1
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](nodeca/js-yaml@4.1.0...4.1.1)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.5.6
  dependency-type: direct:production
  dependency-group: npm_and_yarn
- dependency-name: js-yaml
  dependency-version: 4.1.1
  dependency-type: indirect
  dependency-group: npm_and_yarn
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

frontend/package-lock.json

@@ -28,7 +28,7 @@
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
         "lucide-react": "^0.468.0",
-        "next": "^15.1.0",
+        "next": "^15.5.6",
         "next-themes": "^0.4.6",
         "react": "^18",
         "react-dom": "^18",