chore: update changelog for version 2.0.64

1. Added new changelog entry for version 2.0.64
2. Included release date and maintainer information
3. Follows standard Debian changelog format
4. Maintains chronological order of releases

chore: 更新版本 2.0.64 的变更日志

1. 添加了版本 2.0.64 的新变更日志条目
2. 包含发布日期和维护者信息
3. 遵循标准的 Debian 变更日志格式
4. 保持版本发布的先后顺序

Author: 18202781743

debian/changelog

@@ -1,3 +1,9 @@
+dde-network-core (2.0.64) unstable; urgency=medium
+
+  * Release 2.0.64
+
+ -- YeShanShan <[email protected]>  Thu, 31 Jul 2025 19:44:25 +0800
+
 dde-network-core (2.0.63) unstable; urgency=medium
 
   * i18n: Updates for project Deepin Desktop Environment (#379)