fix: upgrade core-js from 3.6.5 to 3.33.0

Snyk has created this PR to upgrade core-js from 3.6.5 to 3.33.0.

See this package in npm:
https://www.npmjs.com/package/core-js

See this project in Snyk:
https://app.snyk.io/org/mrrio/project/50515eb1-b03b-4f42-9f17-cce1a33d5d1a?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -47,7 +47,7 @@
     "@typescript-eslint/parser": "^3.6.0",
     "chalk": "^4.1.0",
     "codeclimate-test-reporter": "^0.5.1",
-    "core-js": "^3.6.0",
+    "core-js": "^3.33.0",
     "diff": "^4.0.2",
     "docdash": "^1.2.0",
     "eslint": "^7.4.0",