Update WebMVC GraphQL autoconfig to the latest

As a result of changes for
spring-projects/spring-graphql#342,
GraphQlWebSocketHandler now exposes a method to create the
WebSocketHttpRequestHandler, pre-configured with a context propagating
HandshakeInterceptor. This commit updates the autoconfig to use it.

Closes gh-30641

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/graphql/servlet/GraphQlWebMvcAutoConfiguration.java

@@ -69,7 +69,6 @@
 import org.springframework.web.socket.WebSocketHandler;
 import org.springframework.web.socket.server.support.DefaultHandshakeHandler;
 import org.springframework.web.socket.server.support.WebSocketHandlerMapping;
-import org.springframework.web.socket.server.support.WebSocketHttpRequestHandler;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for enabling Spring GraphQL over
@@ -191,7 +190,7 @@ public HandlerMapping graphQlWebSocketMapping(GraphQlWebSocketHandler handler, G
 			WebSocketHandlerMapping mapping = new WebSocketHandlerMapping();
 			mapping.setWebSocketUpgradeMatch(true);
 			mapping.setUrlMap(Collections.singletonMap(path,
-					new WebSocketHttpRequestHandler(handler, new DefaultHandshakeHandler())));
+					handler.asWebSocketHttpRequestHandler(new DefaultHandshakeHandler())));
 			mapping.setOrder(2); // Ahead of HTTP endpoint ("routerFunctionMapping" bean)
 			return mapping;
 		}