fix(event): 解决个别编译环境因缺头文件编译失败的问题

Author: hevake

modules/event/engines/select/fd_event.h

@@ -20,6 +20,8 @@
 #ifndef TBOX_EVENT_SELECT_FD_EVENT_H_20240619
 #define TBOX_EVENT_SELECT_FD_EVENT_H_20240619
 
+#include <cstdint>
+
 #include "../../fd_event.h"
 #include "types.h"