Bump babel-jest from 26.3.0 to 26.6.0

Bumps [babel-jest](https://github.com/facebook/jest/tree/HEAD/packages/babel-jest) from 26.3.0 to 26.6.0.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/jest/commits/v26.6.0/packages/babel-jest)

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