Set apiVersion and languageVersion to 2.0 for backwards compatibility

Author: Hugo Costa

okio/build.gradle.kts

@@ -3,6 +3,7 @@ import com.vanniktech.maven.publish.JavadocJar.Dokka
 import com.vanniktech.maven.publish.KotlinMultiplatform
 import com.vanniktech.maven.publish.MavenPublishBaseExtension
 import kotlinx.validation.ApiValidationExtension
+import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeTargetWithTests
 import org.jetbrains.kotlin.gradle.plugin.mpp.NativeBuildType
 import org.jetbrains.kotlin.gradle.plugin.mpp.TestExecutable
@@ -54,6 +55,15 @@ plugins {
 kotlin {
   configureOrCreateOkioPlatforms()
 
+  targets.all {
+    compilations.all {
+      compilerOptions.configure {
+        apiVersion.set(org.jetbrains.kotlin.gradle.dsl.KotlinVersion.KOTLIN_2_0)
+        languageVersion.set(org.jetbrains.kotlin.gradle.dsl.KotlinVersion.KOTLIN_2_0)
+      }
+    }
+  }
+
   sourceSets {
     all {
       languageSettings.apply {

okio/src/nativeTest/kotlin/okio/NativeSystemFileSystemTest.kt

@@ -15,8 +15,6 @@
  */
 package okio
 
-import kotlin.time.Clock
-
 class NativeSystemFileSystemTest : AbstractFileSystemTest(
   clock = Clock.System,
   fileSystem = FileSystem.SYSTEM,

okio/src/nonWasmTest/kotlin/okio/ForwardingFileSystemTest.kt

@@ -19,7 +19,6 @@ import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertFailsWith
 import kotlin.test.assertTrue
-import kotlin.time.Clock
 import okio.Path.Companion.toPath
 import okio.fakefilesystem.FakeFileSystem
 

okio/src/zlibTest/kotlin/okio/ZipFileSystemGoTest.kt

@@ -17,7 +17,7 @@ package okio
 
 import kotlin.test.Test
 import kotlin.test.assertEquals
-import kotlin.time.Instant
+import kotlinx.datetime.Instant
 import okio.Path.Companion.toPath
 
 /**

okio/src/zlibTest/kotlin/okio/ZipFileSystemTest.kt

@@ -28,7 +28,7 @@ import assertk.assertions.isNull
 import assertk.assertions.isTrue
 import kotlin.test.Test
 import kotlin.test.assertFailsWith
-import kotlin.time.Instant
+import kotlinx.datetime.Instant
 import okio.ByteString.Companion.encodeUtf8
 import okio.Path.Companion.toPath