Bump org.jetbrains.kotlin.jvm from 2.2.21 to 2.3.21 in /plugin

Bumps [org.jetbrains.kotlin.jvm](https://github.com/JetBrains/kotlin) from 2.2.21 to 2.3.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.2.21...v2.3.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.jvm
  dependency-version: 2.3.21
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

plugin/settings.gradle.kts

@@ -5,7 +5,7 @@ pluginManagement {
         // Upside is that we don't need to update the version in the settings.gradle.kts
         // every release
         id("org.jlleitschuh.gradle.ktlint") version "latest.release"
-        id("org.jetbrains.kotlin.jvm") version "2.2.21"
+        id("org.jetbrains.kotlin.jvm") version "2.3.21"
         id("com.gradle.plugin-publish") version "2.0.0"
         `java-gradle-plugin`
         id("com.gradleup.shadow") version "8.3.9"