Bump jest-config from 26.0.1 to 26.1.0 (mastodon#14176)

Bumps [jest-config](https://github.com/facebook/jest/tree/HEAD/packages/jest-config) from 26.0.1 to 26.1.0.
- [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/v26.1.0/packages/jest-config)

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