Bump next from 14.2.20 to 15.1.6

Bumps [next](https://github.com/vercel/next.js) from 14.2.20 to 15.1.6.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.2.20...v15.1.6)

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

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

package.json

@@ -35,7 +35,7 @@
     "install": "^0.13.0",
     "ioredis": "^5.4.1",
     "mobx": "^6.13.5",
-    "next": "^14.2.20",
+    "next": "^15.1.6",
     "next-auth": "^5.0.0-beta.25",
     "npm": "^10.9.0",
     "nprogress": "^0.2.0",