chore(deps): update plugin org.jetbrains.kotlin.jvm to v2.0.21 (#2266)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [org.jetbrains.kotlin.jvm](https://kotlinlang.org/)
([source](https://redirect.github.com/JetBrains/kotlin)) | `2.0.20` ->
`2.0.21` |
[![age](https://developer.mend.io/api/mc/badges/age/maven/org.jetbrains.kotlin.jvm/2.0.21?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/org.jetbrains.kotlin.jvm/2.0.21?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/org.jetbrains.kotlin.jvm/2.0.20/2.0.21?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/org.jetbrains.kotlin.jvm/2.0.20/2.0.21?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

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apps/intellij-extension/build.gradle.kts

@@ -1,6 +1,6 @@
 plugins {
   id("java")
-  id("org.jetbrains.kotlin.jvm") version "2.0.20"
+  id("org.jetbrains.kotlin.jvm") version "2.0.21"
   id("org.jetbrains.intellij") version "1.17.4"
 }