deps(dev): Bump eslint-config-next from 14.2.28 to 15.3.1 in /docs

Bumps [eslint-config-next](https://github.com/vercel/next.js/tree/HEAD/packages/eslint-config-next) from 14.2.28 to 15.3.1.
- [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/v15.3.1/packages/eslint-config-next)

---
updated-dependencies:
- dependency-name: eslint-config-next
  dependency-version: 15.3.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

docs/package.json

@@ -42,7 +42,7 @@
     "@types/react-dom": "^18.3.0",
     "autoprefixer": "^10.4.19",
     "eslint": "^8.57.0",
-    "eslint-config-next": "^14.2.5",
+    "eslint-config-next": "^15.3.1",
     "postcss": "^8.4.39",
     "tailwindcss": "^3.4.6",
     "typescript": "^5.5.3"