Update to Kotlin 2.1+

[Jolanrensen]

Bumping this requires:

• some fixes in the :expression-converter plugin (Kotlin 2.1 and fixes :plugins:expressions-converter #997, can only be merged after updating to 2.1)
• fixing the :generator plugin to workers (Keywords generator plugin: moved and fixed for Kotlin 2.1 #996)
• Updating Gradle to 8.11 https://docs.gradle.org/current/userguide/compatibility.html (for our gradle plugin) (Bumping gradle to 8.11 #1001)
• updating jupyter by moving it to a separate module first: Move Jupyter integration in new dataframe-jupyter module #775
  • (Line_0.jupyter.kts (13:48 - 64) Class 'org.jetbrains.kotlinx.dataframe.jupyter.ImportDataSchema' was compiled with an incompatible version of Kotlin. The actual metadata version is 2.1.0, but the compiler version 1.9.0 can read versions up to 2.0.0.)

EDIT: Apparently, DataFrame cannot target Kotlin 2.1 until the Kotlin Jupyter kernel/notebooks fully support K2. They are planning around February for this.

EDIT2: Jupyter 0.12.0-356 should be compatible with DataFrame targeting 2.1.0 :D

[Omico]

Gradle 8.11.1 has been released. Don't forget to run the gradle wrapper task to update the wrapper jar & scripts.

[Jolanrensen]

After trying to update to Kotlin 2.1 in #997, I bumped into more and more issues, especially regarding our infrastructure.

I would seriously consider dropping our dogfooding approach with the gradle plugin, especially since we're gonna drop it in favor of the compiler plugin. Not only is the KSP version causing issues, but the actual Kotlin Gradle plugin is clashing because it has multiple mismatching versions on the classpath.