Follow project convention for lambda expression

Closes gh-12527

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

@@ -817,7 +817,7 @@ public class WebMvcAutoConfigurationTests {
 					ContentNegotiationManager manager = context
 							.getBean(ContentNegotiationManager.class);
 					assertThat(manager.getStrategies()).anyMatch(
-							strategy -> WebMvcAutoConfiguration.OptionalPathExtensionContentNegotiationStrategy.class
+							(strategy) -> WebMvcAutoConfiguration.OptionalPathExtensionContentNegotiationStrategy.class
 									.isAssignableFrom(strategy.getClass()));
 				});
 	}