fix: set vite bundler in config

Author: chiichen

package.json

@@ -22,5 +22,8 @@
     "vuepress": "2.0.0-rc.9",
     "vuepress-plugin-md-enhance": "2.0.0-rc.38",
     "vuepress-theme-hope": "2.0.0-rc.38"
+  },
+  "dependencies": {
+    "@vuepress/bundler-vite": "2.0.0-rc.9"
   }
 }