build(deps): bump ts-jest from 26.4.3 to 26.4.4 in /lib (wtho#30)

Bumps [ts-jest](https://github.com/kulshekhar/ts-jest) from 26.4.3 to 26.4.4.
- [Release notes](https://github.com/kulshekhar/ts-jest/releases)
- [Changelog](https://github.com/kulshekhar/ts-jest/blob/master/CHANGELOG.md)
- [Commits](kulshekhar/ts-jest@v26.4.3...v26.4.4)

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Author: dependabot[bot]