chore(deps): update plugin org.jetbrains.kotlin.jvm to v1.8.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlin.jvm	1.8.20 -> 1.8.21

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Configuration

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[codecov]

Codecov Report

Merging #72 (521dbf8) into main (065f4aa) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main      #72   +/-   ##
=========================================
  Coverage     73.47%   73.47%           
  Complexity      145      145           
=========================================
  Files            33       33           
  Lines           592      592           
  Branches         43       43           
=========================================
  Hits            435      435           
  Misses          118      118           
  Partials         39       39           

Flag	Coverage Δ
unittests	73.47% <ø> (ø)

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