Update plugin dokka to v1.9.0 (#167)

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

gradle/libs.versions.toml

@@ -25,7 +25,7 @@ moshi = "1.14.0"
 [plugins]
 kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 binaryCompatibilityValidator = { id = "org.jetbrains.kotlinx.binary-compatibility-validator", version = "0.13.2" }
-dokka = { id = "org.jetbrains.dokka", version = "1.8.20" }
+dokka = { id = "org.jetbrains.dokka", version = "1.9.0" }
 ksp = { id = "com.google.devtools.ksp", version.ref = "ksp" }
 mavenPublish = { id = "com.vanniktech.maven.publish", version = "0.25.3" }
 spotless = { id = "com.diffplug.spotless", version = "6.21.0" }