Bump next from 16.1.4 to 16.1.5 in /packages/flags

Bumps [next](https://github.com/vercel/next.js) from 16.1.4 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@v16.1.4...v16.1.5)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.1.5
  dependency-type: direct:development
...

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

Author: dependabot[bot]

packages/flags/package.json

@@ -21,7 +21,7 @@
     "@types/react": "19.2.3",
     "@types/react-dom": "19.2.3",
     "@workspace/typescript-config": "workspace:*",
-    "next": "16.1.4",
+    "next": "16.1.5",
     "typescript": "5.9.3"
   }
 }