chore(deps): Bump kotlinVersion from 2.0.20 to 2.0.21

Bumps `kotlinVersion` from 2.0.20 to 2.0.21.

Updates `org.jetbrains.kotlin.jvm` 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)

Updates `org.jetbrains.kotlin.plugin.serialization` 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: org.jetbrains.kotlin.jvm
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin.plugin.serialization
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

gradle/libs.versions.toml

@@ -6,7 +6,7 @@ io-awspring-cloud = "3.2.0"
 io-confluent = "7.7.1"
 io-swagger-core-v3 = "2.2.24"
 jackson-core = "2.18.0"
-kotlin =  "2.0.20"
+kotlin =  "2.0.21"
 node-plugin = "7.1.0"
 nodeVersion = "22.9.0"
 npm = "10.8.3"