Bump kotlin from 1.9.24 to 2.0.21

Bumps `kotlin` from 1.9.24 to 2.0.21.

Updates `org.jetbrains.kotlin.jvm` from 1.9.24 to 2.0.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.9.24...v2.0.21)

Updates `org.jetbrains.kotlin.multiplatform` from 1.9.24 to 2.0.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.9.24...v2.0.21)

Updates `org.jetbrains.kotlin.plugin.serialization` from 1.9.24 to 2.0.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.9.24...v2.0.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.jvm
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.jetbrains.kotlin.multiplatform
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.jetbrains.kotlin.plugin.serialization
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 graphviz-java = "0.18.1"
 java-cup = "11b-20160615-3"
 jgrapht = "1.5.2"
-kotlin = "1.9.24"
+kotlin = "2.0.21"
 
 [libraries]
 aby-java = { module = "io.github.apl-cornell:aby-java", version = "0.2.2" }