Bump jest and ts-jest (#8)

Bumps [jest](https://github.com/facebook/jest) and [ts-jest](https://github.com/kulshekhar/ts-jest). These dependencies needed to be updated together.

Updates `jest` from 24.9.0 to 25.1.0
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](jestjs/jest@v24.9.0...v25.1.0)

Updates `ts-jest` from 24.3.0 to 25.1.0
- [Release notes](https://github.com/kulshekhar/ts-jest/releases)
- [Changelog](https://github.com/kulshekhar/ts-jest/blob/master/CHANGELOG.md)
- [Commits](kulshekhar/ts-jest@v24.3.0...v25.1.0)

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

Author: dependabot-preview[bot]