Update dependency jest to v25.2.1

[renovate]

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

Compare Source

Fixes

• [*] Downlevel TypeScript definitions files for compatibility with TS<3.8 (#​9705)

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[codecov]

Codecov Report

Merging #179 into master will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #179   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           45        45           
  Lines          418       418           
=========================================
  Hits           418       418           

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