chore(deps): bump next

Bumps the npm_and_yarn group with 1 update in the /www directory: [next](https://github.com/vercel/next.js).


Updates `next` from 15.4.10 to 16.1.5
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.4.10...v16.1.5)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.1.5
  dependency-type: direct:production
  dependency-group: npm_and_yarn
...

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

Author: dependabot[bot]

www/package.json

@@ -53,7 +53,7 @@
     "input-otp": "^1.4.2",
     "katex": "^0.16.22",
     "lucide-react": "^0.487.0",
-    "next": "15.4.10",
+    "next": "16.1.5",
     "next-themes": "^0.4.6",
     "react": "19.2.3",
     "react-day-picker": "8.10.1",