RetryingTest for ClientWebSocketContainerTests

Timing race condition for CPU resources

**Auto-cherry-pick to `7.0.x` & `6.5.x`**

Author: artembilan

spring-integration-websocket/src/test/java/org/springframework/integration/websocket/ClientWebSocketContainerTests.java

@@ -32,6 +32,7 @@
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
+import org.junitpioneer.jupiter.RetryingTest;
 
 import org.springframework.http.HttpHeaders;
 import org.springframework.integration.test.util.TestUtils;
@@ -69,7 +70,7 @@ public static void tearDown() throws Exception {
 		server.destroy();
 	}
 
-	@Test
+	@RetryingTest(10)
 	public void testClientWebSocketContainer() throws Exception {
 		AtomicBoolean failure = new AtomicBoolean();