build: remove deprecated usage

Author: xtexx

build.gradle

@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
 import java.nio.charset.StandardCharsets
 
 plugins {
@@ -42,10 +44,9 @@ indra {
 }
 
 sourceCompatibility = targetCompatibility = JavaVersion.VERSION_17
+
 compileKotlin {
-    kotlinOptions {
-        jvmTarget = '17'
-    }
+    compilerOptions.jvmTarget.set(JvmTarget.JVM_17)
 }
 
 loom {