chore(deps): update dependency org.jetbrains.dokka:dokka-gradle-plugin to v1.6.21

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.dokka:dokka-gradle-plugin	1.6.20 -> 1.6.21

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Release Notes

Kotlin/dokka

### [`v1.6.21`](https://togithub.com/Kotlin/dokka/releases/v1.6.21) This is a bugfix release that mostly enables building documentation for multiplatform projects that utilize `.klib` libraries. #### Changes - Support Kotlin 1.6.21 - Update `jsoup` dependency to avoid [CVE-2021-37714](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37714) ([#​2448](https://togithub.com/Kotlin/dokka/issues/2448)) #### Bugfixes - Support `KLIB` libraries for common platform, previously led to `ERROR CLASS` instead of references in documentation ([#​2441](https://togithub.com/Kotlin/dokka/issues/2441)) - Fixed a maven plugin build problem related to coroutines which only occurred in multi-module builds ([#​2461](https://togithub.com/Kotlin/dokka/issues/2461))

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[codecov[bot]]

Codecov Report

Merging #37 (a9b687c) into main (f7213a8) will not change coverage. The diff coverage is n/a.

:exclamation: Current head a9b687c differs from pull request most recent head ed166bb. Consider uploading reports for the commit ed166bb to get more accurate results

@@            Coverage Diff            @@
##               main      #37   +/-   ##
=========================================
  Coverage     84.34%   84.34%           
  Complexity      112      112           
=========================================
  Files            14       14           
  Lines           492      492           
  Branches         88       88           
=========================================
  Hits            415      415           
  Misses           53       53           
  Partials         24       24           

Flag	Coverage Δ
unittests	84.34% <ø> (ø)

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