Bump kotlin from 2.3.21 to 2.4.0

Bumps `kotlin` from 2.3.21 to 2.4.0.

Updates `org.jetbrains.kotlin:kotlin-gradle-plugin` from 2.3.21 to 2.4.0
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.3.21...v2.4.0)

Updates `org.jetbrains.kotlin.jvm` from 2.3.21 to 2.4.0
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.3.21...v2.4.0)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-gradle-plugin
  dependency-version: 2.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.jetbrains.kotlin.jvm
  dependency-version: 2.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 processor = "2026.4-SNAPSHOT"
 
-kotlin = "2.3.21"
+kotlin = "2.4.0"
 target-jdk = "11"
 build-jdk = "17"
 build-plugins = "2026.3"