Use static private instead of private static for method declarations

Closes gh-25452

spring-tx/src/main/java/org/springframework/transaction/interceptor/TransactionAspectSupport.java

@@ -837,7 +837,7 @@ public abstract class TransactionAspectSupport implements BeanFactoryAware, Init
 	 */
 	private static class KotlinDelegate {
 
-		static private boolean isSuspend(Method method) {
+		private static boolean isSuspend(Method method) {
 			KFunction<?> function = ReflectJvmMapping.getKotlinFunction(method);
 			return function != null && function.isSuspend();
 		}