chore: bump org.jetbrains.kotlin.jvm from 1.8.20 to 1.8.21 (#237)

Bumps [org.jetbrains.kotlin.jvm](https://github.com/JetBrains/kotlin) from 1.8.20 to 1.8.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.8.20...v1.8.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.jvm
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build.gradle.kts

@@ -9,7 +9,7 @@ plugins {
     // Groovy support
     id("groovy")
     // Kotlin support
-    id("org.jetbrains.kotlin.jvm") version "1.8.20"
+    id("org.jetbrains.kotlin.jvm") version "1.8.21"
     // Gradle IntelliJ Plugin
     id("org.jetbrains.intellij") version "1.13.3"
     // Gradle Changelog Plugin