Get rid of deprecated annotations and modifiers in stdlib (besides JS)

libraries/stdlib/test/concurrent/ThreadTest.kt

@@ -9,7 +9,7 @@ import java.util.concurrent.*
 import java.util.concurrent.TimeUnit.*
 
 class ThreadTest {
-    test fun scheduledTask() {
+    @test fun scheduledTask() {
 
         val pool = Executors.newFixedThreadPool(1)
         val countDown = CountDownLatch(1)
@@ -19,7 +19,7 @@ class ThreadTest {
         assertTrue(countDown.await(2, SECONDS), "Count down is executed")
     }
 
-    test fun callableInvoke() {
+    @test fun callableInvoke() {
 
         val pool = Executors.newFixedThreadPool(1)
         val future = pool.submit<String> {  // type specification required here to choose overload for callable, see KT-7882
@@ -28,7 +28,7 @@ class ThreadTest {
         assertEquals("Hello", future.get(2, SECONDS))
     }
 
-    test fun threadLocalGetOrSet() {
+    @test fun threadLocalGetOrSet() {
         val v = ThreadLocal<String>()
 
         assertEquals("v1", v.getOrSet { "v1" })