Update kotlin version - 1.8.20 (#716)

skiko/build.gradle.kts

@@ -9,7 +9,7 @@ import org.jetbrains.kotlin.gradle.tasks.KotlinCompileTool
 import org.jetbrains.kotlin.konan.target.KonanTarget
 
 plugins {
-    kotlin("multiplatform") version "1.8.0"
+    kotlin("multiplatform") version "1.8.20"
     id("org.jetbrains.dokka") version "1.7.20"
     `maven-publish`
     signing

skiko/src/macosMain/kotlin/org/jetbrains/skiko/SkiaLayer.macos.kt

@@ -116,9 +116,7 @@ actual open class SkiaLayer {
                 updateTrackingAreas()
             }
 
-            @ObjCAction // override
-            // see https://youtrack.jetbrains.com/issue/KT-40426/Incorrect-Objective-C-extensions-importing-that-prevents-UIKit-usage#focus=Comments-27-5208687.0-0
-            fun updateTrackingAreas() {
+            override fun updateTrackingAreas() {
                 trackingArea?.let { removeTrackingArea(it) }
                 trackingArea = NSTrackingArea(
                     rect = bounds,