Bump jvm from 2.0.20 to 2.0.21

Bumps [jvm](https://github.com/JetBrains/kotlin) from 2.0.20 to 2.0.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.21/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.20...v2.0.21)

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

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle.kts

@@ -4,7 +4,7 @@ apply(plugin = "maven-publish")
 apply(plugin = "signing")
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("java-library")
     application
     id("signing")