chore(deps-dev): bump core-js from 3.20.3 to 3.21.0 (#207)

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:development
  update-type: version-update:semver-minor
...

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