Update plugin kotlin to v2.2.21

Author: renovate[bot]

gradle/libs.versions.toml

@@ -104,7 +104,7 @@ japicmp = { id = "me.champeau.gradle.japicmp", version = "0.4.6" }
 jmh = { id = "me.champeau.jmh", version = "0.7.3" }
 jreleaser = { id = "org.jreleaser", version = "1.20.0" }
 # check if workaround in gradle.properties can be removed when updating
-kotlin = { id = "org.jetbrains.kotlin.jvm", version = "2.2.20" }
+kotlin = { id = "org.jetbrains.kotlin.jvm", version = "2.2.21" }
 nullaway = { id = "net.ltgt.nullaway", version = "2.3.0" }
 plantuml = { id = "io.freefair.plantuml", version = "9.0.0" }
 shadow = { id = "com.gradleup.shadow", version = "9.2.2" }

platform-tooling-support-tests/projects/gradle-kotlin-extensions/build.gradle.kts

@@ -3,7 +3,7 @@ import org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17
 import org.jetbrains.kotlin.gradle.dsl.KotlinVersion.KOTLIN_2_1
 
 plugins {
-	kotlin("jvm") version "2.2.20"
+	kotlin("jvm") version "2.2.21"
 }
 
 repositories {

platform-tooling-support-tests/projects/kotlin-coroutines/build.gradle.kts

@@ -1,5 +1,5 @@
 plugins {
-	kotlin("jvm") version "2.2.20"
+	kotlin("jvm") version "2.2.21"
 }
 
 val junitVersion: String by project