npm(deps): 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[bot] <support@github.com>

package.json

@@ -43,7 +43,7 @@
     "@angular/platform-browser": "^11.1.0",
     "@angular/platform-browser-dynamic": "^11.1.0",
     "@angular/router": "^11.1.0",
-    "core-js": "^3.6.5",
+    "core-js": "^3.9.1",
     "date-fns": "^2.15.0",
     "rxjs": "^6.6.3",
     "tslib": "^2.0.3",