chore: bump next in /examples/content-source-maps-graphql (#1041)

Bumps [next](https://github.com/vercel/next.js) from 15.0.4 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@v15.0.4...v15.1.2)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

examples/content-source-maps-graphql/package.json

@@ -11,7 +11,7 @@
     "@types/react": "19.0.1",
     "@types/react-dom": "19.0.1",
     "graphql-request": "^6.1.0",
-    "next": "15.0.4",
+    "next": "15.1.2",
     "react": "19.0.0",
     "react-dom": "19.0.0",
     "typescript": "5.0.4"