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](zloirock/core-js@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

@@ -32,7 +32,7 @@
     "bulma-checkradio": "2.1.3",
     "bulma-switch": "2.0.4",
     "bulma-toast": "2.4.1",
-    "core-js": "3.20.3",
+    "core-js": "3.21.0",
     "d3": "7.3.0",
     "date-fns": "2.28.0",
     "elm-pep": "1.0.6",