chore(deps): update dependency ts-jest to v26.4.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ts-jest (source)	devDependencies	patch	26.4.1 -> 26.4.2

---

Release Notes

kulshekhar/ts-jest

v26.4.2

Compare Source

Features

• config: expose several typings as public apis (#​2054) (3b6b705)

Performance Improvements

• compiler: speed up bootstrap time for isolatedModules:false (#​2055) (230b5dd)

DEPRECATIONS

• config: deprecate tsConfig in favor of tsconfig (#​1997)
• config: deprecate packageJson since internal codes don't use it anymore (#​2034)

---

Renovate configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Enabled.

♻️ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR has been generated by WhiteSource Renovate. View repository job log here.

[coveralls]

Coverage remained the same at 100.0% when pulling de3e573 on renovate/ts-jest-26.x into cb5baab on master.