docs: update next.js to 15.3.5 (#12952)

www/apps/cloud/package.json

@@ -17,11 +17,11 @@
     "@mdx-js/loader": "^3.1.0",
     "@mdx-js/react": "^3.1.0",
     "@medusajs/icons": "2.8.7",
-    "@next/mdx": "15.0.4",
+    "@next/mdx": "15.3.5",
     "@stefanprobst/rehype-extract-toc": "^3.0.0",
     "clsx": "^2.1.0",
     "docs-ui": "*",
-    "next": "15.0.4",
+    "next": "15.3.5",
     "react": "rc",
     "react-dom": "rc",
     "rehype-mdx-code-props": "^2.0.0",