Bump core-js from 3.9.1 to 3.10.0 in /Rnwood.Smtp4dev/ClientApp

Bumps [core-js](https://github.com/zloirock/core-js/tree/HEAD/packages/core-js) from 3.9.1 to 3.10.0.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/zloirock/core-js/commits/v3.10.0/packages/core-js)

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

Rnwood.Smtp4dev/ClientApp/package.json

@@ -26,7 +26,7 @@
     "axios": "^0.21.1",
     "babel-eslint": "^10.0.3",
     "brace": "^0.11.1",
-    "core-js": "^3.9.1",
+    "core-js": "^3.10.0",
     "element-ui": "^2.15.1",
     "eslint": "^7.23.0",
     "eslint-plugin-vue": "^7.8.0",