Scripting: fix supplementary test jar compilation

make its version consistent with compilation of the script
that uses it

libraries/scripting/jvm-host-test/test/kotlin/script/experimental/jvmhost/test/CachingTest.kt

@@ -9,6 +9,7 @@ import junit.framework.TestCase
 import kotlinx.coroutines.runBlocking
 import org.jetbrains.kotlin.cli.common.ExitCode
 import org.jetbrains.kotlin.cli.jvm.K2JVMCompiler
+import org.jetbrains.kotlin.scripting.compiler.plugin.impl.SCRIPT_BASE_COMPILER_ARGUMENTS_PROPERTY
 import org.junit.Assert
 import org.junit.Ignore
 import org.junit.Test
@@ -224,12 +225,15 @@ class CachingTest : TestCase() {
     }
 
     private fun makeDependenciesJar(depDir: File, standardJars: List<File>): File {
+        val isK2 = System.getProperty(SCRIPT_BASE_COMPILER_ARGUMENTS_PROPERTY)?.contains("-language-version 1.9") != true
         val outJar = File(depDir, "dependency.jar")
         val inKt = File(depDir, "Dependency.kt").apply { writeText("class Dependency(val v: Int)") }
         val outStream = ByteArrayOutputStream()
         val compileExitCode = K2JVMCompiler().exec(
             PrintStream(outStream),
-            "-d", outJar.path, "-no-stdlib", "-cp", standardJars.joinToString(File.pathSeparator), inKt.path
+            "-d", outJar.path, "-no-stdlib", "-cp", standardJars.joinToString(File.pathSeparator),
+            "-language-version", if (isK2) "2.0" else "1.9",
+            inKt.path
         )
         assertTrue(
             "Compilation Failed:\n$outStream",