Bump org.jetbrains.dokka:dokka-gradle-plugin from 1.8.20 to 1.9.0

Bumps [org.jetbrains.dokka:dokka-gradle-plugin](https://github.com/Kotlin/dokka) from 1.8.20 to 1.9.0.
- [Release notes](https://github.com/Kotlin/dokka/releases)
- [Commits](Kotlin/dokka@v1.8.20...v1.9.0)

---
updated-dependencies:
- dependency-name: org.jetbrains.dokka:dokka-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

build.gradle

@@ -15,7 +15,7 @@ buildscript {
  dependencies {
  classpath 'com.android.tools.build:gradle:7.4.2'
  classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
- classpath 'org.jetbrains.dokka:dokka-gradle-plugin:1.8.20'
+ classpath 'org.jetbrains.dokka:dokka-gradle-plugin:1.9.0'
  }
 }