build(deps): bump next from 15.1.0 to 15.1.2 in /packages/app

Bumps [next](https://github.com/vercel/next.js) from 15.1.0 to 15.1.2.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.1.0...v15.1.2)

---
updated-dependencies:
- dependency-name: next
  dependency-type: direct:production
...

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

Author: dependabot[bot]

packages/app/package.json

@@ -13,7 +13,7 @@
     "@render-agentkit-hacker-news-agent/indexer": "workspace:*",
     "@vercel/postgres": "^0.10.0",
     "inngest": "3.28.0",
-    "next": "15.1.0",
+    "next": "15.1.2",
     "openai": "^4.76.3",
     "pg": "^8.13.1",
     "playwright-core": "^1.49.1",