Update plugin dokka to v1.9.0 (#222)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

gradle/libs.versions.toml

@@ -28,7 +28,7 @@ androidTest = { id = "com.android.test", version.ref = "agp" }
 buildConfig = { id = "com.github.gmazzo.buildconfig", version = "4.1.2" }
 kotlinAndroid = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
 kotlinJvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
-dokka = { id = "org.jetbrains.dokka", version = "1.8.20" }
+dokka = { id = "org.jetbrains.dokka", version = "1.9.0" }
 mavenPublish = { id = "com.vanniktech.maven.publish", version = "0.25.3" }
 poko = { id = "dev.drewhamilton.poko", version = "0.15.0" }
 spotless = { id = "com.diffplug.spotless", version = "6.21.0" }