Upgraded Kotlin to 1.9.0.

Author: ianbrandt

build-logic/src/main/kotlin/org.sdkotlin.buildlogic.kotlin-project.gradle.kts

@@ -9,7 +9,6 @@ plugins {
 }
 
 val javaTargetVersion = JavaVersion.VERSION_17.toString()
-val kotlinTargetVersion = "1.8"
 
 kotlin {
 	jvmToolchain {
@@ -25,8 +24,6 @@ tasks {
 
 	withType<KotlinCompile>().configureEach {
 		kotlinOptions {
-			languageVersion = kotlinTargetVersion
-			apiVersion = kotlinTargetVersion
 			jvmTarget = javaTargetVersion
 			freeCompilerArgs = listOf(
 				"-Xjsr305=strict",

gradle/libs.versions.toml

@@ -8,8 +8,8 @@ jackson = "2.15.1"
 jackson-kogera = "2.14.2-alpha7"
 jakarta-inject = "2.0.0"
 junit = "5.9.3" # Duplicated in unit-test-suite.gradle.kts.
-kotlin = "1.8.10" # See also `kotlinTargetVersion` in kotlin-project.gradle.kts.
-kotlinx-coroutines = "1.7.1"
+kotlin = "1.9.0" # See also `kotlinTargetVersion` in kotlin-project.gradle.kts.
+kotlinx-coroutines = "1.7.2"
 kotlinx-datetime = "0.4.0"
 log4j = "2.20.0"
 log4j-kotlin = "1.2.0"