Bump core-js from 3.8.3 to 3.9.1

Bumps [core-js](https://github.com/zloirock/core-js/tree/HEAD/packages/core-js) from 3.8.3 to 3.9.1.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/zloirock/core-js/commits/v3.9.1/packages/core-js)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -15,7 +15,7 @@
     "apply-loader": "2.0.0",
     "awesome-typescript-loader": "^5.2.1",
     "compare-versions": "^3.6.0",
-    "core-js": "^3.8.3",
+    "core-js": "^3.9.1",
     "cross-env": "7.0.3",
     "css-loader": "5.0.1",
     "electron": "12.0.0",