Bump next from 16.0.6 to 16.0.7 in /samples/mastra-nextjs/app

Bumps [next](https://github.com/vercel/next.js) from 16.0.6 to 16.0.7.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v16.0.6...v16.0.7)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.0.7
  dependency-type: direct:production
...

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

Author: dependabot[bot]

samples/mastra-nextjs/app/package.json

@@ -29,7 +29,7 @@
     "clsx": "^2.1.1",
     "dotenv": "^16.4.7",
     "lucide-react": "^0.475.0",
-    "next": "^16.0.3",
+    "next": "^16.0.7",
     "next-safe-action": "^7.10.3",
     "next-themes": "^0.4.4",
     "octokit": "^5.0.5",