chore(deps): update dependency ts-jest to v26.1.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ts-jest (source)	devDependencies	patch	26.1.3 -> 26.1.4

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Release Notes

kulshekhar/ts-jest

### [`v26.1.4`](https://togithub.com/kulshekhar/ts-jest/blob/master/CHANGELOG.md#​2614-httpsgithubcomkulshekharts-jestcomparev2613v2614-2020-07-28) [Compare Source](https://togithub.com/kulshekhar/ts-jest/compare/v26.1.3...v26.1.4) ##### Bug Fixes - **compiler:** check if test file exists before doing type check ([#​1827](https://togithub.com/kulshekhar/ts-jest/issues/1827)) ([cc89d5b](https://togithub.com/kulshekhar/ts-jest/commit/cc89d5b1f912975cd29114c5b3b0bf18426816da)), closes [#​1506](https://togithub.com/kulshekhar/ts-jest/issues/1506)

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