build(deps): bump core-js from 3.3.4 to 3.3.6 in /website/client

Bumps [core-js](https://github.com/zloirock/core-js) from 3.3.4 to 3.3.6.
- [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/v3.3.4...v3.3.6)

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

website/client/package-lock.json

@@ -3283,9 +3283,9 @@
       }
     },
     "core-js": {
-      "version": "3.3.4",
-      "resolved": "https://registry.npmjs.org/core-js/-/core-js-3.3.4.tgz",
-      "integrity": "sha512-BtibooaAmSOptGLRccsuX/dqgPtXwNgqcvYA6kOTTMzonRxZ+pJS4e+6mvVutESfXMeTnK8m3M+aBu3bkJbR+w=="
+      "version": "3.3.6",
+      "resolved": "https://registry.npmjs.org/core-js/-/core-js-3.3.6.tgz",
+      "integrity": "sha512-u4oM8SHwmDuh5mWZdDg9UwNVq5s1uqq6ZDLLIs07VY+VJU91i3h4f3K/pgFvtUQPGdeStrZ+odKyfyt4EnKHfA=="
     },
     "core-js-compat": {
       "version": "3.3.4",

website/client/package.json

@@ -24,7 +24,7 @@
     "bootstrap": "^4.3.1",
     "bootstrap-vue": "^2.0.4",
     "chai": "^4.1.2",
-    "core-js": "^3.3.4",
+    "core-js": "^3.3.6",
     "eslint": "^6.6.0",
     "eslint-config-habitrpg": "^6.2.0",
     "eslint-plugin-mocha": "^5.3.0",