Fix Http tests for the latest SF

https://build.spring.io/browse/INT-MJATS41-1306/

Author: artembilan

spring-integration-http/src/test/java/org/springframework/integration/http/outbound/HttpRequestExecutingMessageHandlerTests.java

@@ -856,6 +856,7 @@ private HttpHeaders setUpMocksToCaptureSentHeaders(RestTemplate restTemplate) th
 
 		ClientHttpResponse response = mock(ClientHttpResponse.class);
 		when(response.getStatusCode()).thenReturn(HttpStatus.NOT_FOUND);
+		when(response.getRawStatusCode()).thenReturn(HttpStatus.NOT_FOUND.value());
 		when(response.getStatusText()).thenReturn("Not Found");
 		when(response.getBody()).thenReturn(new ByteArrayInputStream(new byte[0]));