Update plugin kotlin-multiplatform to v1.6.20

[juul-mobile-bot]

This PR contains the following updates:

Package	Type	Update	Change
org.jetbrains.kotlin.multiplatform	plugin	patch	1.6.10 -> 1.6.20

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Configuration

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This PR has been generated by Renovate Bot.

[codecov]

Codecov Report

Merging #105 (5e69dc7) into main (56a59f1) will increase coverage by 0.23%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##               main     #105      +/-   ##
============================================
+ Coverage     57.25%   57.49%   +0.23%     
  Complexity       11       11              
============================================
  Files             8        8              
  Lines           613      654      +41     
  Branches        145      145              
============================================
+ Hits            351      376      +25     
- Misses          223      239      +16     
  Partials         39       39              

Impacted Files	Coverage Δ
koap/src/commonMain/kotlin/Message.kt	57.14% <0.00%> (-2.09%)	⬇️
koap/src/commonMain/kotlin/Debug.kt	26.08% <0.00%> (-1.19%)	⬇️
koap/src/commonMain/kotlin/ByteArrayReader.kt	68.08% <0.00%> (-0.10%)	⬇️
koap/src/commonMain/kotlin/Decoder.kt	53.74% <0.00%> (+1.62%)	⬆️
koap/src/commonMain/kotlin/Encoder.kt	71.69% <0.00%> (+3.27%)	⬆️
koap/src/commonMain/kotlin/Option.kt	26.31% <0.00%> (+4.09%)	⬆️

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