upgrade vue-muliselect to beta for Vue 3 support

Author: RayBB

package-lock.json

@@ -90,7 +90,7 @@
     "vue": "^2.7.0",
     "vue-async-computed": "3.9.0",
     "vue-loader": "^15.10.0",
-    "vue-multiselect": "2.1.6",
+    "vue-multiselect": "^3.0.0-beta.2",
     "webpack": "^5.88.2",
     "webpack-cli": "^5.1.4",
     "workbox-webpack-plugin": "6.1.5"