Incompatiable with AGP 9

[FooIbar]

AGP version: 9.0.0-alpha13
To reproduce, first add

android.builtInKotlin=false
android.newDsl=false

to gradle.properties because of #820

Error : You cannot add Provider instances to the Android SourceSet API.
It is not possible for Android Studio to determine if the Provider points
to a directory that contains generated (read-only) or static (read-write) files. 

Instead you should use the Sources interface in the Variant API, in particular
SourceDirectories.addGeneratedDirectory and SourceDirectories.addStaticDirectories.

You can re-enable the behavior by setting the `android.sourceset.disallowProvider=false` to gradle.properties.
However, be aware that any Gradle Task dependency will not be automatically carried.
	at com.android.build.gradle.internal.api.DefaultAndroidSourceDirectorySet.srcDir(DefaultAndroidSourceDirectorySet.kt:84)
	at com.android.build.gradle.internal.api.DefaultAndroidSourceDirectorySet.srcDir(DefaultAndroidSourceDirectorySet.kt:48)
	at dev.icerock.gradle.MultiplatformResourcesPlugin.setupSourceSets(MultiplatformResourcesPlugin.kt:196)
	at dev.icerock.gradle.MultiplatformResourcesPlugin.access$setupSourceSets(MultiplatformResourcesPlugin.kt:41)
	at dev.icerock.gradle.MultiplatformResourcesPlugin$configureKotlinTargetGenerator$2$1$1.invoke(MultiplatformResourcesPlugin.kt:107)
	at dev.icerock.gradle.MultiplatformResourcesPlugin$configureKotlinTargetGenerator$2$1$1.invoke(MultiplatformResourcesPlugin.kt:94)
	at org.jetbrains.kotlin.gradle.utils.MutableObservableSetImpl.forAll(ObservableSet.kt:96)

It seems reverting 9cdab6c and a846e91 would be enough, but I'm not sure if the original issue has been fixed.