Bump org.jetbrains.dokka from 1.6.10 to 1.8.20

Bumps [org.jetbrains.dokka](https://github.com/Kotlin/dokka) from 1.6.10 to 1.8.20.
- [Release notes](https://github.com/Kotlin/dokka/releases)
- [Commits](Kotlin/dokka@v1.6.10...v1.8.20)

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

Signed-off-by: dependabot[bot] <[email protected]>

gradle/libs.versions.toml

@@ -5,7 +5,7 @@ jvmTarget = "1.8"
 
 [plugins]
 detekt = { id = "io.gitlab.arturbosch.detekt", version = "1.19.0" }
-dokka = { id = "org.jetbrains.dokka", version = "1.6.10" }
+dokka = { id = "org.jetbrains.dokka", version = "1.8.20" }
 lint = { id = "com.android.lint", version = "7.1.2" }
 mavenPublish = { id = "com.vanniktech.maven.publish", version = "0.19.0" }
 spotless = { id = "com.diffplug.spotless", version = "6.3.0" }