Update Kotlin to 2.0 (#4137)

Author: qwwdfsad

README.md

@@ -4,11 +4,11 @@
 [![JetBrains official project](https://jb.gg/badges/official.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub)
 [![GitHub license](https://img.shields.io/badge/license-Apache%20License%202.0-blue.svg?style=flat)](https://www.apache.org/licenses/LICENSE-2.0)
 [![Download](https://img.shields.io/maven-central/v/org.jetbrains.kotlinx/kotlinx-coroutines-core/1.8.1)](https://central.sonatype.com/artifact/org.jetbrains.kotlinx/kotlinx-coroutines-core/1.8.1)
-[![Kotlin](https://img.shields.io/badge/kotlin-1.9.21-blue.svg?logo=kotlin)](http://kotlinlang.org)
+[![Kotlin](https://img.shields.io/badge/kotlin-2.0.0-blue.svg?logo=kotlin)](http://kotlinlang.org)
 [![Slack channel](https://img.shields.io/badge/chat-slack-green.svg?logo=slack)](https://kotlinlang.slack.com/messages/coroutines/)
 
 Library support for Kotlin coroutines with [multiplatform](#multiplatform) support.
-This is a companion version for the Kotlin `1.9.21` release.
+This is a companion version for the Kotlin `2.0.0` release.
 
 ```kotlin
 suspend fun main() = coroutineScope {
@@ -93,7 +93,7 @@ And make sure that you use the latest Kotlin version:
 
 ```xml
 <properties>
-    <kotlin.version>1.9.21</kotlin.version>
+    <kotlin.version>2.0.0</kotlin.version>
 </properties>
 ```
 
@@ -112,10 +112,10 @@ And make sure that you use the latest Kotlin version:
 ```kotlin
 plugins {
     // For build.gradle.kts (Kotlin DSL)
-    kotlin("jvm") version "1.9.21"
+    kotlin("jvm") version "2.0.0"
 
     // For build.gradle (Groovy DSL)
-    id "org.jetbrains.kotlin.jvm" version "1.9.21"
+    id "org.jetbrains.kotlin.jvm" version "2.0.0"
 }
 ```
 

gradle.properties

@@ -1,7 +1,7 @@
 # Kotlin
 version=1.8.1-SNAPSHOT
 group=org.jetbrains.kotlinx
-kotlin_version=2.0.0-RC3
+kotlin_version=2.0.0
 kotlin_language_version=2.0
 # DO NOT rename this property without adapting kotlinx.train build chain:
 atomicfu_version=0.23.2

integration-testing/gradle.properties

@@ -1,4 +1,4 @@
-kotlin_version=2.0.0-RC3
+kotlin_version=2.0.0
 coroutines_version=1.8.1-SNAPSHOT
 asm_version=9.3