Update dependency ts-jest to v25.2.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ts-jest (source)	devDependencies	patch	25.2.0 -> 25.2.1

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Release Notes

kulshekhar/ts-jest

v25.2.1

Compare Source

Bug Fixes

• compiler: allow transformation of typescript files in node_modules (#​1385) (814405e)
• docs: fixing slack link and some minor typos in documenation (#​1404) (3e2e008)
• transformer: add deepUnmock to hoist method list (#​1372) (0fbbc00)
• util: use resolve package typescript package in yarn workspaces (#​1377) (a63808c)

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