chore(deps): update dependency vuex to v4

Author: renovate[bot]

package.json

@@ -63,7 +63,7 @@
     "vuetify": "2.6.14",
     "vuetify-confirm": "2.0.6",
     "vuetify-loader": "1.8.0",
-    "vuex": "3.6.2",
+    "vuex": "4.1.0",
     "vuex-ltm": "1.1.1",
     "vuex-shared-mutations": "1.0.2"
   }