chore(deps): update dependency vuex to v4

Author: renovate[bot]

package-lock.json

@@ -68,7 +68,7 @@
     "vue": "2.7.14",
     "vue-class-component": "7.2.6",
     "vue-template-compiler": "2.7.14",
-    "vuex": "3.6.2"
+    "vuex": "4.1.0"
   },
   "jest": {
     "roots": [