build(deps): bump core-js from 3.5.0 to 3.6.0 in /website/client (#11649)

Bumps [core-js](https://github.com/zloirock/core-js) from 3.5.0 to 3.6.0.
- [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/compare/v3.5.0...v3.6.0)

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

website/client/package.json

@@ -31,7 +31,7 @@
     "bootstrap": "^4.4.1",
     "bootstrap-vue": "^2.1.0",
     "chai": "^4.1.2",
-    "core-js": "^3.5.0",
+    "core-js": "^3.6.0",
     "eslint": "^6.7.2",
     "eslint-config-habitrpg": "^6.2.0",
     "eslint-plugin-mocha": "^5.3.0",