chore(deps): update dependency ts-jest to v26.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ts-jest (source)	devDependencies	minor	26.3.0 -> 26.4.0

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Release Notes

kulshekhar/ts-jest

### [`v26.4.0`](https://togithub.com/kulshekhar/ts-jest/blob/master/CHANGELOG.md#​2640-httpsgithubcomkulshekharts-jestcomparev2630v2640-2020-09-20) [Compare Source](https://togithub.com/kulshekhar/ts-jest/compare/v26.3.0...v26.4.0) ##### Bug Fixes - **utils:** `pathsToModuleNameMapper` resolve path mapping with `path.join` ([#​1969](https://togithub.com/kulshekhar/ts-jest/issues/1969)) ([81fce4c](https://togithub.com/kulshekhar/ts-jest/commit/81fce4c090811a1cc071579a99dc193fb976b117)), closes [#​1968](https://togithub.com/kulshekhar/ts-jest/issues/1968) - set minimum `jest-util` version at 26.1.0 ([#​1914](https://togithub.com/kulshekhar/ts-jest/issues/1914)) ([f00414c](https://togithub.com/kulshekhar/ts-jest/commit/f00414c6fbf8fc5413fd33d0a271c4a164c50d45)), closes [#​1913](https://togithub.com/kulshekhar/ts-jest/issues/1913) ##### Features - **config:** allow custom options in custom transformers ([#​1966](https://togithub.com/kulshekhar/ts-jest/issues/1966)) ([1452ce4](https://togithub.com/kulshekhar/ts-jest/commit/1452ce4afcd36049cddd0db0861f1ac26b66f8c1)), closes [#​1942](https://togithub.com/kulshekhar/ts-jest/issues/1942) - **transformers:** support hoisting when using `@jest/globals` ([#​1937](https://togithub.com/kulshekhar/ts-jest/issues/1937)) ([0e5be15](https://togithub.com/kulshekhar/ts-jest/commit/0e5be1597d755fed11869f67df05eeea54b3106f)), closes [#​1593](https://togithub.com/kulshekhar/ts-jest/issues/1593) - **transformers:** add `path-mapping` custom AST transformer ([#​1927](https://togithub.com/kulshekhar/ts-jest/issues/1927)) ([3325186](https://togithub.com/kulshekhar/ts-jest/commit/3325186b6e55f41eb9bf7d81e092a358fc402b13)) ##### Performance Improvements - **compiler:** remove `createProgram` for `isolatedModules: true` to boost startup speed ([#​1941](https://togithub.com/kulshekhar/ts-jest/issues/1941)) ([dd84534](https://togithub.com/kulshekhar/ts-jest/commit/dd8453401840862186f991e2d514e0d328a67987))

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