Bump next from 14.2.12 to 14.2.20 in /frontend

Bumps [next](https://github.com/vercel/next.js) from 14.2.12 to 14.2.20.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.2.12...v14.2.20)

---
updated-dependencies:
- dependency-name: next
  dependency-type: direct:production
...

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

frontend/package.json

@@ -42,7 +42,7 @@
     "jsonschema": "^1.4.1",
     "lodash-es": "^4.17.21",
     "markdown-to-jsx": "^7.4.7",
-    "next": "14.2.12",
+    "next": "14.2.20",
     "next-remove-imports": "^1.0.12",
     "notistack": "^3.0.1",
     "pretty-bytes": "^6.1.1",