build(deps): bump core-js from 3.20.3 to 3.21.0 in /website/client (#13838)

Bumps [core-js](https://github.com/zloirock/core-js) from 3.20.3 to 3.21.0.
- [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/v3.20.3...v3.21.0)

---
updated-dependencies:
- dependency-name: core-js
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

website/client/package-lock.json

@@ -16061,9 +16061,9 @@
       }
     },
     "core-js": {
-      "version": "3.20.3",
-      "resolved": "https://registry.npmjs.org/core-js/-/core-js-3.20.3.tgz",
-      "integrity": "sha512-vVl8j8ph6tRS3B8qir40H7yw7voy17xL0piAjlbBUsH7WIfzoedL/ZOr1OV9FyZQLWXsayOJyV4tnRyXR85/ag=="
+      "version": "3.21.0",
+      "resolved": "https://registry.npmjs.org/core-js/-/core-js-3.21.0.tgz",
+      "integrity": "sha512-YUdI3fFu4TF/2WykQ2xzSiTQdldLB4KVuL9WeAy5XONZYt5Cun/fpQvctoKbCgvPhmzADeesTk/j2Rdx77AcKQ=="
     },
     "core-js-compat": {
       "version": "3.11.0",

website/client/package.json

@@ -32,7 +32,7 @@
     "bootstrap": "^4.6.0",
     "bootstrap-vue": "^2.21.2",
     "chai": "^4.3.6",
-    "core-js": "^3.20.3",
+    "core-js": "^3.21.0",
     "eslint": "^6.8.0",
     "eslint-config-habitrpg": "^6.2.0",
     "eslint-plugin-mocha": "^5.3.0",