fix: upgrade core-js from 3.30.2 to 3.33.0

Snyk has created this PR to upgrade core-js from 3.30.2 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/oph-snyk/project/e98c570d-17e5-45b6-b6f3-3d2dabe744c3?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

frontend/package-lock.json

@@ -62,7 +62,7 @@
   "dependencies": {
     "@babel/runtime": "7.23.1",
     "axios": "1.4.0",
-    "core-js": "3.30.2",
+    "core-js": "3.33.0",
     "date-fns": "2.30.0",
     "dotenv": "16.1.4",
     "js-cookie": "3.0.5",