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

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -72,7 +72,7 @@
     "vue": "^2.7.16",
     "vue-loader": "^17.4.2",
     "vue-material-design-icons": "^5.3.1",
-    "vue-router": "^3.6.5",
+    "vue-router": "^4.6.4",
     "vuedraggable": "^2.24.3",
     "webdav": "^5.8.0"
   },