Update org.jetbrains.dokka:dokka-gradle-plugin to v2.1.0 (#521)

Also removes redundant Gradle properties, including those that became
redundant with other PRs.

Co-authored-by: Gabriel Féo <gabriel@gabrielfeo.com>

Author: renovate[bot]

gradle.properties

@@ -8,11 +8,3 @@ org.gradle.jvmargs=-Xmx5g
 org.gradle.caching=true
 org.gradle.configuration-cache=true
 org.gradle.configuration-cache.parallel=true
-# Becomes default in Gradle 9.0
-org.gradle.kotlin.dsl.skipMetadataVersionCheck=false
-# Explicitly added at different versions, due to Kotlin/kotlin-jupyter#462
-kotlin.jupyter.add.api=false
-kotlin.jupyter.add.scanner=false
-kotlin.jupyter.add.testkit=false
-org.jetbrains.dokka.experimental.gradle.pluginMode=V2Enabled
-org.jetbrains.dokka.experimental.gradle.pluginMode.noWarn=true

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 kotlin = "2.2.10"
 kotlin-stdlib = "2.0.0"
-dokka = "2.0.0"
+dokka = "2.1.0"
 openapi-generator = "7.16.0"
 jupyter = "0.15.0-650"
 okio = "3.16.2"