chore(deps): upgrade to Vite 6 Beta 9

Author: ghiscoding

packages/demo/package.json

@@ -19,6 +19,6 @@
     "fflate": "0.8.2",
     "sass": "^1.79.5",
     "typescript": "^5.6.3",
-    "vite": "^5.4.8"
+    "vite": "^6.0.0-beta.9"
   }
 }

packages/excel-builder-vanilla/package.json

@@ -66,6 +66,6 @@
     "copyfiles": "^2.4.1",
     "dts-bundle-generator": "^9.5.1",
     "typescript": "^5.6.3",
-    "vite": "^5.4.8"
+    "vite": "^6.0.0-beta.9"
   }
 }