Update Kotlin to 1.8.21

[soywiz]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.02 ⚠️

Comparison is base (8a0f366) 51.56% compared to head (6cd1d18) 51.55%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1551      +/-   ##
==========================================
- Coverage   51.56%   51.55%   -0.02%     
==========================================
  Files        1669     1669              
  Lines       98155    98155              
  Branches    13981    13981              
==========================================
- Hits        50616    50602      -14     
- Misses      43661    43667       +6     
- Partials     3878     3886       +8     

Flag	Coverage Δ
unittests	51.55% <ø> (-0.02%)	⬇️

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see 24 files with indirect coverage changes

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