Bump next in /frontend in the npm_and_yarn group across 1 directory

Bumps the npm_and_yarn group with 1 update in the /frontend directory: [next](https://github.com/vercel/next.js).


Updates `next` from 15.5.4 to 15.5.7
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.5.4...v15.5.7)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.5.7
  dependency-type: direct:production
  dependency-group: npm_and_yarn
...

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -10,7 +10,7 @@
   "dependencies": {
     "@types/react-virtualized-auto-sizer": "^1.0.4",
     "@types/react-window": "^1.8.8",
-    "next": "15.5.4",
+    "next": "15.5.7",
     "react": "19.1.0",
     "react-dom": "19.1.0",
     "react-syntax-highlighter": "^16.1.0",