fix: upgrade core-js from 3.21.0 to 3.21.1

Snyk has created this PR to upgrade core-js from 3.21.0 to 3.21.1.

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

See this project in Snyk:
https://app.snyk.io/org/ytetsuro/project/5c9d5982-3265-4dba-90fc-6fc790ca8257?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -13,7 +13,7 @@
     "bulma": "^0.9.3",
     "codemirror": "^5.65.1",
     "commander": "^7.2.0",
-    "core-js": "^3.21.0",
+    "core-js": "^3.21.1",
     "decimal.js": "^10.3.1",
     "esbuild": "^0.14.13",
     "inversify": "^5.1.1",