Bump jest from 26.1.0 to 26.4.1 (actions#50)

Bumps [jest](https://github.com/facebook/jest) from 26.1.0 to 26.4.1.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](jestjs/jest@v26.1.0...v26.4.1)

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