Upgraded to Kotlin 1.8.20.

Author: ianbrandt

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

@@ -1,3 +1,4 @@
+import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
@@ -8,8 +9,8 @@ plugins {
 	kotlin("jvm")
 }
 
-val javaTargetVersion = JavaVersion.VERSION_17.toString()
-val kotlinTargetVersion = "1.9"
+val javaTargetVersion: String = JavaVersion.VERSION_17.toString()
+val kotlinTargetVersion: String = KotlinVersion.KOTLIN_1_9.version
 
 kotlin {
 	jvmToolchain {

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ equalsverifier = "3.14"
 jetbrains-annotations = "24.0.1"
 junit = "5.9.2" # Duplicated in unit-test-suite.gradle.kts.
 koin = "3.3.3"
-kotlin = "1.8.10" # See also `kotlinTargetVersion` in kotlin-project.gradle.kts.
+kotlin = "1.8.20" # See also `kotlinTargetVersion` in kotlin-project.gradle.kts.
 kotlintest = "3.4.2"
 kotlinx-coroutines = "1.6.4"
 kotlinx-dl = "0.5.1"