Bumps [jest](https://github.com/facebook/jest) from 18.1.0 to 26.6.3.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/jest/compare/v18.1.0...v26.6.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

• Commit f4e5d91
• #73: Bump jest from 18.1.0 to 26.6.3
• Branch master

dependabot[bot]