Use valueOf rather than parseInt as result is assigned to an int

See gh-22209

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/ServerPropertiesTests.java

@@ -519,7 +519,7 @@ class ServerPropertiesTests {
 			template.postForEntity(URI.create("http://localhost:" + jetty.getPort() + "/form"), entity, Void.class);
 			assertThat(failure.get()).isNotNull();
 			String message = failure.get().getCause().getMessage();
-			int defaultMaxPostSize = Integer.valueOf(message.substring(message.lastIndexOf(' ')).trim());
+			int defaultMaxPostSize = Integer.parseInt(message.substring(message.lastIndexOf(' ')).trim());
 			assertThat(this.properties.getJetty().getMaxHttpFormPostSize().toBytes()).isEqualTo(defaultMaxPostSize);
 		}
 		finally {