build(deps): bump core-js from 3.8.2 to 3.8.3 in /website/client (#13003)

Bumps [core-js](https://github.com/zloirock/core-js) from 3.8.2 to 3.8.3.
- [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/v3.8.2...v3.8.3)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

website/client/package.json

@@ -31,7 +31,7 @@
     "bootstrap": "^4.6.0",
     "bootstrap-vue": "^2.21.2",
     "chai": "^4.1.2",
-    "core-js": "^3.8.2",
+    "core-js": "^3.8.3",
     "eslint": "^6.8.0",
     "eslint-config-habitrpg": "^6.2.0",
     "eslint-plugin-mocha": "^5.3.0",