Bump @nx/jest from 19.2.0 to 20.0.6

Bumps [@nx/jest](https://github.com/nrwl/nx/tree/HEAD/packages/jest) from 19.2.0 to 20.0.6.
- [Release notes](https://github.com/nrwl/nx/releases)
- [Commits](https://github.com/nrwl/nx/commits/20.0.6/packages/jest)

---
updated-dependencies:
- dependency-name: "@nx/jest"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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