Bump next from 15.0.3 to 15.1.2 in /landing (#216)

Bumps [next](https://github.com/vercel/next.js) from 15.0.3 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](https://github.com/vercel/next.js/compare/v15.0.3...v15.1.2)

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

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

landing/package.json

@@ -16,7 +16,7 @@
     "autoprefixer": "^10.4.20",
     "eslint": "^9.14.0",
     "eslint-config-next": "^15.0.3",
-    "next": "^15.0.3",
+    "next": "^15.1.2",
     "postcss": "^8.4.47",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",