Adapt to changes in the locking model for closing an app context

See gh-38666

Author: wilkinsona

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/SpringApplicationShutdownHookTests.java

@@ -112,8 +112,8 @@ void runWhenContextIsBeingClosedInAnotherThreadWaitsUntilContextIsInactive() thr
 		closing.await();
 		Thread shutdownThread = new Thread(shutdownHook);
 		shutdownThread.start();
-		// Shutdown thread should become blocked on monitor held by context thread
-		Awaitility.await().atMost(Duration.ofSeconds(30)).until(shutdownThread::getState, State.BLOCKED::equals);
+		// Shutdown thread should start waiting for context to become inactive
+		Awaitility.await().atMost(Duration.ofSeconds(30)).until(shutdownThread::getState, State.TIMED_WAITING::equals);
 		// Allow context thread to proceed, unblocking shutdown thread
 		proceedWithClose.countDown();
 		contextThread.join();