Upgrade to Dokka 2.1.0

Closes gh-35532

buildSrc/build.gradle

@@ -20,7 +20,7 @@ ext {
 dependencies {
 	checkstyle "io.spring.javaformat:spring-javaformat-checkstyle:${javaFormatVersion}"
 	implementation "org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlinVersion}"
-	implementation "org.jetbrains.dokka:dokka-gradle-plugin:2.1.0-Beta"
+	implementation "org.jetbrains.dokka:dokka-gradle-plugin:2.1.0"
 	implementation "com.tngtech.archunit:archunit:1.4.1"
 	implementation "org.gradle:test-retry-gradle-plugin:1.6.2"
 	implementation "io.spring.javaformat:spring-javaformat-gradle-plugin:${javaFormatVersion}"

gradle.properties

@@ -9,6 +9,3 @@ byteBuddyVersion=1.17.6
 
 kotlin.jvm.target.validation.mode=ignore
 kotlin.stdlib.default.dependency=false
-
-org.jetbrains.dokka.experimental.gradle.pluginMode.noWarn=true
-org.jetbrains.dokka.experimental.gradle.pluginMode=V2Enabled