Bump eslint-config-next from 14.2.3 to 14.2.15 in /frontend

Bumps [eslint-config-next](https://github.com/vercel/next.js/tree/HEAD/packages/eslint-config-next) from 14.2.3 to 14.2.15.
- [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/v14.2.15/packages/eslint-config-next)

---
updated-dependencies:
- dependency-name: eslint-config-next
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -29,7 +29,7 @@
     "autoprefixer": "10.4.19",
     "clsx": "^2.1.1",
     "eslint": "8.57.0",
-    "eslint-config-next": "14.2.3",
+    "eslint-config-next": "14.2.15",
     "framer-motion": "^11.11.7",
     "intl-messageformat": "^10.5.14",
     "next": "14.2.14",