chore(deps-dev): bump eslint-config-next in /frontend

Bumps [eslint-config-next](https://github.com/vercel/next.js/tree/HEAD/packages/eslint-config-next) from 16.1.6 to 16.2.4.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/commits/v16.2.4/packages/eslint-config-next)

---
updated-dependencies:
- dependency-name: eslint-config-next
  dependency-version: 16.2.4
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

frontend/package.json

@@ -45,7 +45,7 @@
     "@vitest/coverage-v8": "^4.1.0",
     "concurrently": "^9.2.1",
     "eslint": "^9",
-    "eslint-config-next": "16.1.6",
+    "eslint-config-next": "16.2.4",
     "jsdom": "^28.1.0",
     "prettier": "^3.3.3",
     "tailwindcss": "^4",