build(deps): bump org.jetbrains.kotlin.jvm in /code_samples/kotlin_demo

Bumps [org.jetbrains.kotlin.jvm](https://github.com/JetBrains/kotlin) from 1.9.25 to 2.0.20.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.20/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.9.25...v2.0.20)

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

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

code_samples/kotlin_demo/build.gradle.kts

@@ -3,7 +3,7 @@
 plugins {
  id("java")
  id("org.jetbrains.intellij") version "1.17.4"
- id("org.jetbrains.kotlin.jvm") version "1.9.25"
+ id("org.jetbrains.kotlin.jvm") version "2.0.20"
 }
 
 group = "org.intellij.sdk"