Update dependency ts-jest to v26.1.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ts-jest (source)	devDependencies	patch	26.1.0 -> 26.1.1

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Release Notes

kulshekhar/ts-jest

### [`v26.1.1`](https://togithub.com/kulshekhar/ts-jest/blob/master/CHANGELOG.md#​2611-httpsgithubcomkulshekharts-jestcomparev2610v2611-2020-06-21) [Compare Source](https://togithub.com/kulshekhar/ts-jest/compare/v26.1.0...v26.1.1) ##### Bug Fixes - **compiler:** generate source map correctly when tsconfig `mapRoot` is set ([#​1741](https://togithub.com/kulshekhar/ts-jest/issues/1741)) ([01ac417](https://togithub.com/kulshekhar/ts-jest/commit/01ac417)), closes [#​1718](https://togithub.com/kulshekhar/ts-jest/issues/1718) - **config:** show version warning when using ts-jest without babel ([#​1729](https://togithub.com/kulshekhar/ts-jest/issues/1729)) ([e512bc0](https://togithub.com/kulshekhar/ts-jest/commit/e512bc0)), fixes [#​1678-issuecomment-641930332](https://togithub.com//github.com/kulshekhar/ts-jest/pull/1678/issues/issuecomment-641930332), [#​1678-issuecomment-639528993](https://togithub.com//github.com/kulshekhar/ts-jest/pull/1678/issues/issuecomment-639528993)

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