Bump core-js from 3.19.2 to 3.19.3 in /Rnwood.Smtp4dev/ClientApp

Bumps [core-js](https://github.com/zloirock/core-js) from 3.19.2 to 3.19.3.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](zloirock/core-js@v3.19.2...v3.19.3)

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

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

Rnwood.Smtp4dev/ClientApp/package.json

@@ -27,7 +27,7 @@
     "axios": "^0.24.0",
     "babel-eslint": "^10.0.3",
     "brace": "^0.11.1",
-    "core-js": "^3.19.2",
+    "core-js": "^3.19.3",
     "element-ui": "^2.15.6",
     "eslint": "^7.32.0",
     "eslint-plugin-vue": "^7.20.0",