Bump vue-router from 3.4.1 to 3.4.2 in /Rnwood.Smtp4dev/ClientApp

Bumps [vue-router](https://github.com/vuejs/vue-router) from 3.4.1 to 3.4.2.
- [Release notes](https://github.com/vuejs/vue-router/releases)
- [Changelog](https://github.com/vuejs/vue-router/blob/dev/CHANGELOG.md)
- [Commits](vuejs/vue-router@v3.4.1...v3.4.2)

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

Rnwood.Smtp4dev/ClientApp/package.json

@@ -31,7 +31,7 @@
     "srcdoc-polyfill": "^1.0.0",
     "ts-debounce": "^1.0.0",
     "typescript": "~3.9.7",
-    "vue-router": "^3.4.1",
+    "vue-router": "^3.4.2",
     "vue-template-compiler": "^2.6.10",
     "vue2-ace-editor": "0.0.15",
     "@fortawesome/fontawesome-free": "^5.13.0",