chore(deps-dev): bump @babel/core from 7.7.2 to 7.9.6 (#140)

Bumps [@babel/core](https://github.com/babel/babel) from 7.7.2 to 7.9.6.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](babel/babel@v7.7.2...v7.9.6)

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Author: dependabot-preview[bot]