Update Kotlin to 1.6.20 (#3235)

Author: qwwdfsad

README.md

@@ -91,7 +91,7 @@ And make sure that you use the latest Kotlin version:
 
 ```xml
 <properties>
-    <kotlin.version>1.6.0</kotlin.version>
+    <kotlin.version>1.6.20</kotlin.version>
 </properties>
 ```
 
@@ -110,10 +110,10 @@ And make sure that you use the latest Kotlin version:
 ```kotlin
 plugins {
     // For build.gradle.kts (Kotlin DSL)
-    kotlin("jvm") version "1.6.0"
+    kotlin("jvm") version "1.6.20"
 
     // For build.gradle (Groovy DSL)
-    id "org.jetbrains.kotlin.jvm" version "1.6.0"
+    id "org.jetbrains.kotlin.jvm" version "1.6.20"
 }
 ```
 

benchmarks/src/jmh/kotlin/benchmarks/ParametrizedDispatcherBase.kt

@@ -25,7 +25,6 @@ abstract class ParametrizedDispatcherBase : CoroutineScope {
     private var closeable: Closeable? = null
 
     @Setup
-    @UseExperimental(InternalCoroutinesApi::class)
     open fun setup() {
         coroutineContext = when {
             dispatcher == "fjp" -> ForkJoinPool.commonPool().asCoroutineDispatcher()

gradle.properties

@@ -5,7 +5,7 @@
 # Kotlin
 version=1.6.1-SNAPSHOT
 group=org.jetbrains.kotlinx
-kotlin_version=1.6.0
+kotlin_version=1.6.20
 
 # Dependencies
 junit_version=4.12

kotlinx-coroutines-core/jvm/test/DispatcherKeyTest.kt

@@ -8,7 +8,7 @@ import org.junit.Test
 import kotlin.coroutines.*
 import kotlin.test.*
 
-@UseExperimental(ExperimentalStdlibApi::class)
+@OptIn(ExperimentalStdlibApi::class)
 class DispatcherKeyTest : TestBase() {
 
     companion object CustomInterceptor : AbstractCoroutineContextElement(ContinuationInterceptor),

kotlinx-coroutines-test/common/test/TestDispatchersTest.kt

@@ -23,7 +23,6 @@ class TestDispatchersTest: OrderedExecutionTestBase() {
 
     /** Tests that asynchronous execution of tests does not happen concurrently with [AfterTest]. */
     @Test
-    @NoJs
     fun testMainMocking() = runTest {
         val mainAtStart = TestMainDispatcher.currentTestDispatcher
         assertNotNull(mainAtStart)