Bump vue-router from 3.4.7 to 3.4.9 in /Rnwood.Smtp4dev/ClientApp

Bumps [vue-router](https://github.com/vuejs/vue-router) from 3.4.7 to 3.4.9.
- [Release notes](https://github.com/vuejs/vue-router/releases)
- [Changelog](https://github.com/vuejs/vue-router/blob/dev/CHANGELOG.md)
- [Commits](vuejs/vue-router@v3.4.7...v3.4.9)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Rnwood.Smtp4dev/ClientApp/package.json

@@ -33,7 +33,7 @@
     "srcdoc-polyfill": "^1.0.0",
     "ts-debounce": "^2.0.1",
     "typescript": "~4.0.5",
-    "vue-router": "^3.4.7",
+    "vue-router": "^3.4.9",
     "vue-template-compiler": "^2.6.12",
     "vue2-ace-editor": "0.0.15",
     "@fortawesome/fontawesome-free": "^5.15.1",