Bump @vue/cli-plugin-babel in /Rnwood.Smtp4dev/ClientApp

Bumps [@vue/cli-plugin-babel](https://github.com/vuejs/vue-cli/tree/HEAD/packages/@vue/cli-plugin-babel) from 4.5.3 to 4.5.4.
- [Release notes](https://github.com/vuejs/vue-cli/releases)
- [Changelog](https://github.com/vuejs/vue-cli/blob/dev/CHANGELOG.md)
- [Commits](https://github.com/vuejs/vue-cli/commits/v4.5.4/packages/@vue/cli-plugin-babel)

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

Rnwood.Smtp4dev/ClientApp/package.json

@@ -13,7 +13,7 @@
     "@aspnet/signalr": "^1.0.4",
     "@typescript-eslint/eslint-plugin": "^2.34.0",
     "@typescript-eslint/parser": "^2.34.0",
-    "@vue/cli-plugin-babel": "^4.5.3",
+    "@vue/cli-plugin-babel": "^4.5.4",
     "@vue/cli-plugin-eslint": "^4.5.3",
     "@vue/cli-plugin-typescript": "^4.4.6",
     "@vue/cli-service": "^4.3.1",