chore(deps-dev): bump @babel/core from 7.8.4 to 7.11.6 (umijs#513)

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.8.4 to 7.11.6.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.11.6/packages/babel-core)

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