Update dependency org.jetbrains.dokka:dokka-gradle-plugin to v1.9.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.dokka:dokka-gradle-plugin	1.8.20 -> 1.9.0

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Configuration

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[codecov]

Codecov Report

Merging #493 (6e786c2) into master (5707220) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #493   +/-   ##
=========================================
  Coverage     80.84%   80.84%           
  Complexity      114      114           
=========================================
  Files            16       16           
  Lines           642      642           
  Branches        102      102           
=========================================
  Hits            519      519           
  Misses           49       49           
  Partials         74       74