Update dependency jest to v25.2.1

[renovate[bot]]

This PR contains the following updates:

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

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Release Notes

facebook/jest

### [`v25.2.1`](https://togithub.com/facebook/jest/blob/master/CHANGELOG.md#​2521) [Compare Source](https://togithub.com/facebook/jest/compare/v25.2.0...v25.2.1) ##### Fixes - `[*]` Downlevel TypeScript definitions files for compatibility with TS<3.8 ([#​9705](https://togithub.com/facebook/jest/pull/9705))

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[codecov[bot]]

Codecov Report

Merging #54 into master will not change coverage by %. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #54   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            5         5           
  Lines           41        41           
  Branches         3         3           
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  Hits            41        41