chore(deps): update plugin dokka to v1.9.20

Author: renovate[bot]

gradle/libs.versions.toml

@@ -12,6 +12,6 @@ kotest-assertions-core-jvm = { module = "io.kotest:kotest-assertions-core-jvm",
 kotlin-testing = ["kotest-junit5", "kotest-assertions-core", "kotest-assertions-core-jvm"]
 
 [plugins]
-dokka = { id ="org.jetbrains.dokka", version = "1.9.10" }
+dokka = { id ="org.jetbrains.dokka", version = "1.9.20" }
 kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 kotlin-qa = { id = "org.danilopianini.gradle-kotlin-qa", version = "0.58.0" }