fix(deps): bump core-js from 3.20.3 to 3.21.0

Bumps [core-js](https://github.com/zloirock/core-js) from 3.20.3 to 3.21.0.
- [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/compare/v3.20.3...v3.21.0)

---
updated-dependencies:
- dependency-name: core-js
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -46,7 +46,7 @@
     "color-convert": "^2.0.1",
     "color-name": "^1.1.4",
     "convert-units": "^2.3.4",
-    "core-js": "^3.20.3",
+    "core-js": "^3.21.0",
     "cron-validator": "^1.3.1",
     "cronstrue": "^1.123.0",
     "crypto-js": "^4.1.1",