After JetBrains/compose-multiplatform-core#687 it is no longer required.
We should remove it in all sourcesets, except commonMain, androidMain
Example:
// foundation module
@OptIn(ExperimentalFoundationApi::class) // it is no longer needed
class SomeClass
// material module
@OptIn(ExperimentalFoundationApi::class) // still needed (and shouldn't be used to keep backward compatibility)
class SomeClass