Bumps [core-js](https://github.com/zloirock/core-js) from 3.4.7 to 3.4.8.
- [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/v3.4.7...v3.4.8

)

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