Update plugin org.jetbrains.kotlin.jvm to v2.0.21

Author: renovate[bot]

build.gradle.kts

@@ -14,7 +14,7 @@ plugins {
     // Java support
     id("java")
     // Kotlin support
-    id("org.jetbrains.kotlin.jvm") version "2.0.20"
+    id("org.jetbrains.kotlin.jvm") version "2.0.21"
     // gradle-intellij-plugin - read more: https://github.com/JetBrains/gradle-intellij-plugin
     id("org.jetbrains.intellij.platform") version "2.1.0"
 //    id("org.jetbrains.intellij.platform.migration") version "2.0.0-beta7"