chore: upgrade Rolldown 1.0.0-rc.9

Author: lazarv

packages/react-server/package.json

@@ -231,7 +231,7 @@
     "react-server-dom-webpack": "0.0.0-experimental-46103596-20260305",
     "remark-frontmatter": "^5.0.0",
     "remark-mdx-frontmatter": "^4.0.0",
-    "rolldown": "1.0.0-rc.8",
+    "rolldown": "1.0.0-rc.9",
     "sass": "^1.86.0",
     "semver": "^7.6.3",
     "smol-toml": "^1.6.0",