Use Kotlin 1.4.0 in Gradle tests

gradle-plugins/compose/src/test/kotlin/org/jetbrains/compose/test/TestProject.kt

@@ -21,7 +21,9 @@ data class TestProject(
 
             if (orig.name.endsWith(".gradle") || orig.name.endsWith(".gradle.kts")) {
                 val origContent = orig.readText()
-                val newContent = origContent.replace("COMPOSE_VERSION_PLACEHOLDER", TestProperties.composeVersion)
+                val newContent = origContent
+                    .replace("COMPOSE_VERSION_PLACEHOLDER", TestProperties.composeVersion)
+                    .replace("KOTLIN_VERSION_PLACEHOLDER", TestProperties.kotlinVersion)
                 target.writeText(newContent)
             } else {
                 orig.copyTo(target)

gradle-plugins/compose/src/test/kotlin/org/jetbrains/compose/test/TestProperties.kt

@@ -1,6 +1,8 @@
 package org.jetbrains.compose.test
 
 object TestProperties {
+    val kotlinVersion: String = "1.4.0"
+
     val composeVersion: String
         get() = System.getProperty("compose.plugin.version")!!
 

gradle-plugins/compose/src/test/test-projects/application/jvm/settings.gradle

@@ -1,6 +1,6 @@
 pluginManagement {
     plugins {
-        id 'org.jetbrains.kotlin.jvm' version '1.4.10'
+        id 'org.jetbrains.kotlin.jvm' version 'KOTLIN_VERSION_PLACEHOLDER'
         id 'org.jetbrains.compose' version 'COMPOSE_VERSION_PLACEHOLDER'
     }
     repositories {

gradle-plugins/compose/src/test/test-projects/application/jvmKotlinDsl/settings.gradle

@@ -1,6 +1,6 @@
 pluginManagement {
     plugins {
-        id 'org.jetbrains.kotlin.jvm' version '1.4.10'
+        id 'org.jetbrains.kotlin.jvm' version 'KOTLIN_VERSION_PLACEHOLDER'
         id 'org.jetbrains.compose' version 'COMPOSE_VERSION_PLACEHOLDER'
     }
     repositories {

gradle-plugins/compose/src/test/test-projects/application/mpp/settings.gradle

@@ -1,6 +1,6 @@
 pluginManagement {
     plugins {
-        id 'org.jetbrains.kotlin.multiplatform' version '1.4.10'
+        id 'org.jetbrains.kotlin.multiplatform' version 'KOTLIN_VERSION_PLACEHOLDER'
         id 'org.jetbrains.compose' version 'COMPOSE_VERSION_PLACEHOLDER'
     }
     repositories {