KSFunctionDeclaration.findOverridee() returns null for equals/hashCode/toString on interfaces in KSP2 with Kotlin 2.3.x

In KSP1 these returned `kotlin.Any`, which is what I would expect.
I'm using Kotlin 2.3.20, KSP 2.3.6, JVM target.

```
interface Foo {
val bar: Int
}
```

```
class MyFooProcessor(private val env: SymbolProcessorEnvironment) : SymbolProcessor {
override fun process(resolver: Resolver): List {
val foo = resolver.getClassDeclarationByName("Foo")!!
for (function in foo.getAllFunctions()) {
checkNotNull(function.findOverridee())
}
return emptyList()
}
}
```