⬆️ Bump org.jetbrains.kotlin.jvm from 2.3.10 to 2.3.21 (#201)

Bumps [org.jetbrains.kotlin.jvm](https://github.com/JetBrains/kotlin) from 2.3.10 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@v2.3.10...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-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -6,7 +6,7 @@ opentest4j = "1.3.0"
 # plugins
 changelog = "2.5.0"
 intelliJPlatform = "2.16.0"
-kotlin = "2.3.10"
+kotlin = "2.3.21"
 kover = "0.9.8"
 qodana = "2026.1.0"