fix: upgrade vue-router from 4.0.0-rc.3 to 4.0.5

Snyk has created this PR to upgrade vue-router from 4.0.0-rc.3 to 4.0.5.

See this package in npm:
https://www.npmjs.com/package/vue-router

See this project in Snyk:
https://app.snyk.io/org/blacklight/project/96bfd125-5816-4d9e-83c6-94d1569ab0f1?utm_source=github&utm_medium=upgrade-pr

platypush/backend/http/webapp/package.json

@@ -17,7 +17,7 @@
     "node-sass": "^5.0.0",
     "sass-loader": "^10.1.0",
     "vue": "^3.0.0",
-    "vue-router": "^4.0.0-rc.3",
+    "vue-router": "^4.0.5",
     "vue-skycons": "^4.0.3",
     "w3css": "^2.7.0"
   },