Incompatible with Kotlin 2.0

It seems the ki-shell is incompatible with Kotlin 2.0. We now get the following errors when we try to execute code; more specifically if we call any function (just assigning variables does not seem to trigger it):

```
The root cause java.lang.IllegalStateException was thrown at: org.jetbrains.kotlin.ir.util.SymbolTableSlice$Scoped.noScope(SymbolTableSlice.kt:178) (Line_16.kts): org.jetbrains.kotlin.backend.common.BackendException: Backend Internal error: Exception during psi2ir
```

I tried manually upgrading the Kotlin version to 2.0 and using the artefact in our project, but that does not help.

Any ideas?

Start by reproducing the failure in ki-shell with Kotlin 2.0, comparing a variable assignment with a function call as described. Inspect the Kotlin version configuration and the reported psi2ir/SymbolTableSlice exception; done means function calls execute successfully without the BackendException.

Written by the indexing model from the issue text.