Update dependency ts-jest to v26.1.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ts-jest (source)	devDependencies	minor	26.0.0 -> 26.1.0

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Release Notes

kulshekhar/ts-jest

### [`v26.1.0`](https://togithub.com/kulshekhar/ts-jest/blob/master/CHANGELOG.md#​2610-httpsgithubcomkulshekharts-jestcomparev2600v2610-2020-05-30) [Compare Source](https://togithub.com/kulshekhar/ts-jest/compare/v26.0.0...v26.1.0) ##### Bug Fixes - **typing:** don't mark `BabelConfig` as internal type ([#​1667](https://togithub.com/kulshekhar/ts-jest/issues/1667)) ([558c307](https://togithub.com/kulshekhar/ts-jest/commit/558c307)), closes [#​1666](https://togithub.com/kulshekhar/ts-jest/issues/1666) ##### Features - **config:** show a warning message when TypeScript `target` version doesn't match with recommended NodeJs version ([#​1678](https://togithub.com/kulshekhar/ts-jest/issues/1678)) ([085bdf5](https://togithub.com/kulshekhar/ts-jest/commit/085bdf5)) - **config:** support multiple paths for `pathsToModuleNameMapper` ([#​1690](https://togithub.com/kulshekhar/ts-jest/issues/1690)) ([a727bd5](https://togithub.com/kulshekhar/ts-jest/commit/a727bd5)) - support TypeScript 3.9 ([#​1653](https://togithub.com/kulshekhar/ts-jest/issues/1653)) ([fc3d5ad](https://togithub.com/kulshekhar/ts-jest/commit/fc3d5ad))

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