deps: bump jest from 26.3.0 to 26.4.0 (#450)

Bumps [jest](https://github.com/facebook/jest) from 26.3.0 to 26.4.0.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](jestjs/jest@v26.3.0...v26.4.0)

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