fix: upgrade core-js from 3.8.3 to 3.35.1

Snyk has created this PR to upgrade core-js from 3.8.3 to 3.35.1.

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

See this project in Snyk:
https://app.snyk.io/org/evan-axm/project/c5b3f88f-d983-44f9-b77a-afe0b952fdb4?utm_source=github&utm_medium=referral&page=upgrade-pr

superset-frontend/packages/superset-ui-demo/package.json

@@ -45,7 +45,7 @@
     "@types/react-loadable": "^5.5.3",
     "antd": "4.10.3",
     "bootstrap": "^3.4.1",
-    "core-js": "3.8.3",
+    "core-js": "3.35.1",
     "gh-pages": "^3.0.0",
     "jquery": "^3.7.1",
     "memoize-one": "^5.1.1",