build(deps): bump merge and ts-jest

Removes [merge](https://github.com/yeikos/js.merge). It's no longer used after updating ancestor dependency [ts-jest](https://github.com/kulshekhar/ts-jest). These dependencies need to be updated together.


Removes `merge`

Updates `ts-jest` from 23.10.5 to 29.0.5
- [Release notes](https://github.com/kulshekhar/ts-jest/releases)
- [Changelog](https://github.com/kulshekhar/ts-jest/blob/main/CHANGELOG.md)
- [Commits](kulshekhar/ts-jest@v23.10.5...v29.0.5)

---
updated-dependencies:
- dependency-name: merge
  dependency-type: indirect
- dependency-name: ts-jest
  dependency-type: direct:development
...

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