Fix checkstyle violation

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

@@ -367,8 +367,7 @@ class TomcatWebServerFactoryCustomizerTests {
 	}
 
 	@Test
-	@Deprecated
+	@Deprecated(since = "2.7.12", forRemoval = true)
-	@SuppressWarnings("deprecation")
 	void testCustomizeRejectIllegalHeader() {
 		bind("server.tomcat.reject-illegal-header=false");
 		customizeAndRunServer((server) -> assertThat(