build(deps-dev): bump ts-jest from 26.5.1 to 26.5.4 in /shared/package

Bumps [ts-jest](https://github.com/kulshekhar/ts-jest) from 26.5.1 to 26.5.4.
- [Release notes](https://github.com/kulshekhar/ts-jest/releases)
- [Changelog](https://github.com/kulshekhar/ts-jest/blob/master/CHANGELOG.md)
- [Commits](kulshekhar/ts-jest@v26.5.1...v26.5.4)

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