chore(deps): update devdependency @types/jest to v26.0.15

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@types/jest	devDependencies	patch	26.0.14 -> 26.0.15

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[codecov]

Codecov Report

Merging #27 into main will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #27   +/-   ##
=======================================
  Coverage   87.43%   87.43%           
=======================================
  Files           6        6           
  Lines         191      191           
  Branches       71       71           
=======================================
  Hits          167      167           
  Misses         23       23           
  Partials        1        1           

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