Upgrade demo dependencies

Author: titouanmathis

packages/demo/package.json

@@ -15,7 +15,7 @@
     "remark": "15.0.1"
   },
   "dependencies": {
-    "@studiometa/js-toolkit": "^2.12.1",
+    "@studiometa/js-toolkit": "^3.0.0",
     "@studiometa/ui": "^0.2.54",
     "tailwindcss": "^4.0.0",
     "vue": "^3.5.13"