Bump next from 15.3.5 to 15.4.2

Bumps [next](https://github.com/vercel/next.js) from 15.3.5 to 15.4.2.
- [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/compare/v15.3.5...v15.4.2)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.4.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "chart.js": "^4.5.0",
     "mongodb": "^6.17.0",
-    "next": "15.3.5",
+    "next": "15.4.2",
     "next-auth": "^4.24.11",
     "react": "^19.0.0",
     "react-chartjs-2": "^5.3.0",