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kotlinlang

`org.jetbrains.kotlin.gradle.plugin.mpp.pm20.util.KotlinProjectExtension.targets` is deprecated, and says to replace it with `org.jetbrains.kotlin.gradle.utils.KotlinProjectExtension.targets` but that is `internal`

Use <https://kotlinlang.org/api/kotlin-gradle-plugin/kotlin-gradle-plugin-api/org.jetbrains.kotlin.gradle.plugin/-kotlin-targets-container/|KotlinTargetsContainer> type which now only `org.jetbrains.kotlin.gradle.dsl.KotlinMultiplatformExtension` implements