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

Author: renovate[bot]

package.json

@@ -57,7 +57,7 @@
     "vis-util": "5.0.3",
     "vue": "2.6.14",
     "vue-cli-plugin-vuetify": "2.5.1",
-    "vue-router": "3.5.4",
+    "vue-router": "4.1.1",
     "vue-template-compiler": "2.6.14",
     "vuelidate": "0.7.7",
     "vuetify": "2.6.7",