Set jvmTarget on all Kotlin compilation tasks

Ensures Java & Kotlin compilation tasks have aligned JVM source & target
versions. Required when recent Kotlin & Gradle versions are used together.

Author: 3flex

build.gradle

@@ -1,3 +1,6 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompilationTask
+
 buildscript {
     ext.kotlin_version = '1.9.10'
     ext.embedded_kotlin_version = '1.9.10'
@@ -157,6 +160,12 @@ subprojects {
 
     sourceCompatibility = 1.8
 
+    tasks.withType(KotlinCompilationTask).configureEach {
+        compilerOptions {
+            jvmTarget = JvmTarget.JVM_1_8
+        }
+    }
+
     if (JavaVersion.current() >= JavaVersion.VERSION_16) {
         test {
             jvmArgs = [