!21 转换License为SPDX格式，并更新License内容

From: @protkhn 
Reviewed-by: @dillon_chen 
Signed-off-by: @dillon_chen

at.spec

@@ -1,8 +1,8 @@
 Name:             at
 Version:          3.2.5
-Release:          1
+Release:          2
 Summary:          A job manager
-License:          GPLv3+, GPLv2+, ISC, MIT, Public Domain
+License:          GPL-3.0-or-later AND GPL-2.0-or-later AND ISC
 URL:              http://ftp.debian.org/debian/pool/main/a/at
 Source0:          http://software.calhariz.com/at/at_%{version}.orig.tar.gz
 Source1:          pam_atd
@@ -122,6 +122,13 @@ chown root:root %{_localstatedir}/spool/at/.SEQ
 %{_mandir}/man*/*
 
 %changelog
+* Tue Apr 30 2024 Han Jinpeng <hanjinpeng@kylinos.cn> - 3.2.5-2
+- Type：update
+- ID：NA
+- SUG:NA
+- DESC: Modify the license to SPDX format
+        Delete MIT and Public Domain license because it no longer appears in the upstream source
+
 * Tue Dec 27 2022 zhangnan <zhangnan134@huawei.com> - 3.2.5-1
 - Type：enhancement
 - ID：NA