docs: update license references in README files

Updated license references in both English and Chinese README files to
use consistent GPL-3.0-or-later license identifier. Changed the license
reference in README.md from GPLv3 to GPL-3.0-or-later and corrected
the license in README.zh_CN.md from LGPL-3.0-or-later to GPL-3.0-or-
later to ensure consistency across documentation and accurate license
representation.

Influence:
1. Verify license references are consistent in both language versions
2. Check that LICENSE file content matches the referenced license
3. Confirm build and distribution compliance with GPL-3.0-or-later
requirements

docs: 更新 README 文件中的许可证引用

更新了英文和中文 README 文件中的许可证引用，使用一致的 GPL-3.0-or-later
许可证标识符。将 README.md 中的许可证引用从 GPLv3 更改为 GPL-3.0-or-
later，并将 README.zh_CN.md 中的许可证从 LGPL-3.0-or-later 更正为 GPL-
3.0-or-later，以确保文档一致性和准确的许可证表示。

Influence:
1. 验证两个语言版本中的许可证引用是否一致
2. 检查 LICENSE 文件内容是否与引用的许可证匹配
3. 确认构建和分发符合 GPL-3.0-or-later 许可证要求

Author: mhduiy

README.md

@@ -71,4 +71,4 @@ We encourage you to report issues and contribute changes
 
 ## License
 
-dde-session is licensed under [GPLv3](LICENSE).
+dde-session is licensed under [GPL-3.0-or-later](LICENSE).

README.zh_CN.md

@@ -73,4 +73,4 @@ Exec=/usr/bin/dde-session
 
 ## License
 
-dde-session 在 [LGPL-3.0-or-later](LICENSE)下发布。
+dde-session 在 [GPL-3.0-or-later](LICENSE)下发布。