Not compatible with Kotest v6.0.1

It looks like the extension doesn't work with the latest stable Kotest which is 6.0.1. This simple test fails
```kotlin
@RobolectricTest
class SimpleTest :
    BehaviorSpec({
        given("An app is launched") {
            then("Application is initialised") {
                RuntimeEnvironment.getApplication().shouldNotBeNull()
            }
        }
    })
```