build: clean up the main build script

Set LV to 2.1, and restore the 1.8 JVM target.

Author: lppedd

build.gradle.kts

@@ -1,9 +1,5 @@
-@file:OptIn(ExperimentalKotlinGradlePluginApi::class)
-
 import io.github.petertrr.configurePublishing
 import io.github.petertrr.ext.booleanProperty
-import io.gitlab.arturbosch.detekt.Detekt
-import org.jetbrains.kotlin.gradle.ExperimentalKotlinGradlePluginApi
 import org.jetbrains.kotlin.gradle.ExperimentalWasmDsl
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
@@ -26,16 +22,16 @@ kotlin {
     explicitApi()
 
     compilerOptions {
-        apiVersion = KotlinVersion.KOTLIN_1_9
-        languageVersion = KotlinVersion.KOTLIN_1_9
+        apiVersion = KotlinVersion.KOTLIN_2_1
+        languageVersion = KotlinVersion.KOTLIN_2_1
     }
 
     jvm {
         compilations.configureEach {
             compileTaskProvider.configure {
                 compilerOptions {
                     // Minimum bytecode level is 52
-                    jvmTarget = JvmTarget.JVM_11
+                    jvmTarget = JvmTarget.JVM_1_8
 
                     // Output interfaces with default methods
                     freeCompilerArgs.addAll(
@@ -105,9 +101,7 @@ detekt {
 }
 
 tasks {
-    withType<Detekt> {
-        named("check") {
-            dependsOn(this@withType)
-        }
+    check {
+        dependsOn(detekt)
     }
 }

gradle.properties

@@ -1,6 +1,12 @@
-kotlin.code.style=official
-org.gradle.jvmargs=-Xmx2g -XX:MaxMetaspaceSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
-org.gradle.caching=true
-# https://kotlinlang.org/docs/whatsnew19.html#preview-of-gradle-configuration-cache
-org.gradle.configuration-cache=false
-org.gradle.parallel=true
+#########################
+# Gradle settings
+#########################
+org.gradle.jvmargs = -Xmx2g -XX:MaxMetaspaceSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
+org.gradle.parallel = true
+org.gradle.caching = true
+org.gradle.configuration-cache = true
+
+#########################
+# Kotlin settings
+#########################
+kotlin.code.style = official