Bump core-js from 3.6.0 to 3.6.1

Bumps [core-js](https://github.com/zloirock/core-js) from 3.6.0 to 3.6.1.
- [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/v3.6.0...v3.6.1

)

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