Bump promise-polyfill from 8.1.3 to 8.3.0 (#6104)

Bumps [promise-polyfill](https://github.com/taylorhakes/promise-polyfill) from 8.1.3 to 8.3.0.
- [Release notes](https://github.com/taylorhakes/promise-polyfill/releases)
- [Changelog](https://github.com/taylorhakes/promise-polyfill/blob/master/CHANGELOG.md)
- [Commits](https://github.com/taylorhakes/promise-polyfill/commits)

---
updated-dependencies:
- dependency-name: promise-polyfill
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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packages/core/package.json

@@ -36,7 +36,7 @@
     "codemirror": "5.63.0",
     "codemirror-formatting": "1.0.0",
     "html-entities": "~1.4.0",
-    "promise-polyfill": "8.1.3",
+    "promise-polyfill": "8.3.0",
     "underscore": "1.13.1"
   },
   "devDependencies": {