chore(core-deps): update plugin kotlin-serialization to v1.9.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlin.plugin.serialization	1.9.20 -> 1.9.21

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e183419) 78.17% compared to head (768be50) 78.17%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #150   +/-   ##
=========================================
  Coverage     78.17%   78.17%           
  Complexity      205      205           
=========================================
  Files            52       52           
  Lines          1072     1072           
  Branches        156      156           
=========================================
  Hits            838      838           
  Misses          132      132           
  Partials        102      102           

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