Bump next from 14.2.12 to 14.2.20 in /webapp

Bumps [next](https://github.com/vercel/next.js) from 14.2.12 to 14.2.20.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.2.12...v14.2.20)

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

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

webapp/package.json

@@ -15,7 +15,7 @@
     "@trpc/next": "^10.44.1",
     "@trpc/react-query": "^10.44.1",
     "@trpc/server": "^10.44.1",
-    "next": "^14.2.12",
+    "next": "^14.2.20",
     "prisma": "^5.7.1",
     "react": "^18",
     "react-dom": "^18",