[Test] Use JDK 11 instead of JDK 9 in modern jdk tests

compiler/testData/codegen/boxModernJdk/testsWithJava11/kt36984.kt

@@ -0,0 +1,18 @@
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND: JVM_IR
+//  ^ JVM_IR back-end generates SAM conversion with invokedynamic
+// WITH_RUNTIME
+
+fun box(): String {
+    val f = {}
+    val sam = Runnable(f)
+    val samJavaClass = sam::class.java
+
+    if (samJavaClass.simpleName != "")
+        throw Exception("samJavaClass.simpleName='${samJavaClass.simpleName}'")
+
+    if (!samJavaClass.isAnonymousClass())
+        throw Exception("!samJavaClass.isAnonymousClass(): '${samJavaClass.name}'")
+
+    return "OK"
+}