chore(deps): update plugin org.jetbrains.kotlin.multiplatform to v1.6.20

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlin.multiplatform	1.6.10 -> 1.6.20

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[codecov]

Codecov Report

Merging #69 (587b59b) into master (79e43ba) will increase coverage by 0.65%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
+ Coverage   79.61%   80.27%   +0.65%     
==========================================
  Files          20       20              
  Lines         368      370       +2     
  Branches       57       57              
==========================================
+ Hits          293      297       +4     
  Misses         56       56              
+ Partials       19       17       -2     

Impacted Files	Coverage Δ
...ommonMain/kotlin/com/hoc081098/flowext/throttle.kt	81.03% <0.00%> (+0.33%)	⬆️
...rc/commonMain/kotlin/com/hoc081098/flowext/race.kt	64.15% <0.00%> (+0.68%)	⬆️
...c/commonMain/kotlin/com/hoc081098/flowext/Event.kt	82.75% <0.00%> (+6.89%)	⬆️

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