Revert "Remove 'withJava()' calls"

This reverts commit ef067f8.

Author: Tapchicoma

buildSrc/src/main/kotlin/source-sets-conventions.gradle.kts

@@ -28,6 +28,7 @@ kotlin {
     explicitApi()
 
     jvm {
+        withJava()
         @OptIn(ExperimentalKotlinGradlePluginApi::class)
         compilerOptions {
             jvmTarget = JvmTarget.JVM_1_8