demo: update diff pkg

Author: Thanga-Ganapathy

apps/demo/package.json

@@ -16,7 +16,7 @@
     "@fontsource/inter": "^5.0.18",
     "@mui/icons-material": "^5.15.15",
     "@mui/joy": "5.0.0-beta.36",
-    "@opentf/obj-diff": "^0.8.0",
+    "@opentf/obj-diff": "^0.9.0",
     "@opentf/std": "^0.12.0",
     "@uiw/react-codemirror": "^4.22.0",
     "prettier": "^3.2.5",