Update plugin org.jetbrains.kotlin.jvm to v1.8.20

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlin.jvm	1.8.10 -> 1.8.20

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Configuration

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[codecov]

Codecov Report

Merging #126 (fd15211) into master (8bd168b) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #126   +/-   ##
=========================================
  Coverage     69.23%   69.23%           
  Complexity       41       41           
=========================================
  Files             4        4           
  Lines           143      143           
  Branches         28       28           
=========================================
  Hits             99       99           
  Misses           26       26           
  Partials         18       18           

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