fix(deps): update dependency vue-router to v4

Author: renovate[bot]

package.json

@@ -32,7 +32,7 @@
     "vis-data": "7.1.9",
     "vis-network": "9.1.9",
     "vue": "2.7.16",
-    "vue-router": "3.6.5",
+    "vue-router": "4.4.4",
     "vuetify": "2.7.2",
     "vuetify-confirm": "2.0.6",
     "vuex": "3.6.2",