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

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ts-jest (source)	devDependencies	major	25.5.1 -> 26.1.0

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Release Notes

kulshekhar/ts-jest

v26.1.0

Compare Source

Bug Fixes

• typing: don't mark BabelConfig as internal type (#​1667) (558c307), closes #​1666

Features

• config: show a warning message when TypeScript target version doesn't match with recommended NodeJs version (#​1678) (085bdf5)
• config: support multiple paths for pathsToModuleNameMapper (#​1690) (a727bd5)
• support TypeScript 3.9 (#​1653) (fc3d5ad)

v26.0.0

Compare Source

Bug Fixes

• compiler: return undefined for getScriptVersion when a file doesn't exist in memory cache (#​1641) (6851b8e)

Features

• support Jest v26 (#​1602) (23b7741)

BREAKING CHANGES

• Requires a minimum of TypeScript v3.8
• Drop support for Node 8

25.5.1 (2020-05-09)

Bug Fixes

• compiler: don't resolve files from build folder for projectReferences (#​1614) (74b92d3)
• config: don't set include value of tsconfig to empty array (#​1606) (8a29aaa)

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