chore(deps): bump org.jetbrains.dokka from 1.8.20 to 1.9.0

Bumps [org.jetbrains.dokka](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
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

build.gradle.kts

@@ -9,7 +9,7 @@ plugins {
     `maven-publish`
     signing
     id("io.github.gradle-nexus.publish-plugin") version "1.3.0"
-    id("org.jetbrains.dokka") version "1.8.20"
+    id("org.jetbrains.dokka") version "1.9.0"
 }
 
 group = "nl.sanderdijkhuis"