Update to Dokka 2.0.0

Author: whyoleg

core/build.gradle.kts

@@ -408,8 +408,10 @@ tasks.withType<AbstractDokkaLeafTask>().configureEach {
     pluginsMapConfiguration.set(mapOf("org.jetbrains.dokka.base.DokkaBase" to """{ "templatesDir" : "${projectDir.toString().replace('\\', '/')}/dokka-templates" }"""))
 
     failOnWarning.set(true)
+    dokkaSourceSets.named("commonMain") {
+        samples.from(kotlin.sourceSets.commonTest.map { it.kotlin.srcDirs })
+    }
     dokkaSourceSets.configureEach {
-        kotlin.sourceSets.commonTest.get().kotlin.srcDirs.forEach { samples.from(it) }
         // reportUndocumented.set(true) // much noisy output about `hashCode` and serializer encoders, decoders etc
         skipDeprecated.set(true)
         // Enum members and undocumented toString()

gradle.properties

@@ -8,7 +8,7 @@ versionSuffix=SNAPSHOT
 tzdbVersion=2025a
 
 defaultKotlinVersion=1.9.21
-dokkaVersion=1.9.20
+dokkaVersion=2.0.0
 serializationVersion=1.6.2
 benchmarksVersion=0.7.2