Bump core-js from 3.1.4 to 3.2.1

Bumps [core-js](https://github.com/zloirock/core-js) from 3.1.4 to 3.2.1.
- [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/compare/3.1.4...v3.2.1)

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