Bump org.jetbrains.kotlin.jvm from 2.0.0 to 2.0.21

Bumps [org.jetbrains.kotlin.jvm](https://github.com/JetBrains/kotlin) from 2.0.0 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@v2.0.0...v2.0.21)

---
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]>

gradle/libs.versions.toml

@@ -10,7 +10,7 @@ mwe2 = "2.19.0"
 slf4j = "2.0.16"
 log4j = "2.24.1"
 xtext = "2.36.0"
-kotlin = "2.0.0"
+kotlin = "2.0.21"
 kotlinxCoroutines = "1.9.0"
 kotlinxCli = "0.3.6"
 viatra = "2.9.1"