Update dependency vuex to v4

package.json

@@ -40,6 +40,6 @@
     "scriptjs": "2.5.9",
     "vue": "2.7.16",
     "vuetify": "2.7.2",
-    "vuex": "3.6.2"
+    "vuex": "4.1.0"
   }
 }