Update dependency vue-router to v4

Author: renovate[bot]

package-lock.json

@@ -10,7 +10,7 @@
   "dependencies": {
     "core-js": "2.6.9",
     "vue": "2.6.10",
-    "vue-router": "3.1.0"
+    "vue-router": "4.3.1"
   },
   "devDependencies": {
     "@vue/cli-plugin-babel": "3.10.0",