Bump axios from 0.21.1 to 0.21.4 in /Rnwood.Smtp4dev/ClientApp

Bumps [axios](https://github.com/axios/axios) from 0.21.1 to 0.21.4.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/master/CHANGELOG.md)
- [Commits](axios/axios@v0.21.1...v0.21.4)

---
updated-dependencies:
- dependency-name: axios
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Rnwood.Smtp4dev/ClientApp/package.json

@@ -23,7 +23,7 @@
     "@vue/eslint-config-typescript": "^7.0.0",
     "aspnet-webpack": "^3.0.0",
     "async-mutex": "^0.3.2",
-    "axios": "^0.21.1",
+    "axios": "^0.21.4",
     "babel-eslint": "^10.0.3",
     "brace": "^0.11.1",
     "core-js": "^3.16.4",