fix: upgrade vue-router from 3.1.3 to 3.1.3

Snyk has created this PR to upgrade vue-router from 3.1.3 to 3.1.3.

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

See this project in Snyk:
https://app.snyk.io/org/drakeg-github-marketplace/project/e4152ff1-70f7-4a91-a675-f64dc0c54c5f?utm_source=github&utm_medium=upgrade-pr

final_project/frontend/package.json

@@ -11,7 +11,7 @@
     "core-js": "^2.6.5",
     "serialize-javascript": "^2.1.1",
     "vue": "^2.6.10",
-    "vue-router": "^3.0.3"
+    "vue-router": "^3.1.3"
   },
   "devDependencies": {
     "@vue/cli-plugin-babel": "^3.0.1",