feat: update changelog and version

[pengfeixx]

Update changelog and version

[github-actions]

TAG Bot

TAG: 6.5.9
EXISTED: no
DISTRIBUTION: unstable

[deepin-ci-robot]

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This pull-request has been approved by: pengfeixx

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: pengfeixx

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[deepin-ci-robot]

deepin pr auto review

这个提交的改动主要是更新了 Debian 包的 changelog 文件，添加了一个新的版本号 6.5.9。从代码审查的角度来看，这个改动是合理的，但以下几点需要注意：

1. 版本号更新：确保版本号 6.5.9 是正确的，并且与实际发布的版本一致。
2. 描述性注释：在 changelog 中添加的注释 "chore: New version 6.5.9" 是简短的，建议提供更详细的更新内容描述，以便于其他开发者理解这次版本更新的具体内容。
3. 日期格式：日期格式是正确的，但建议使用 ISO 8601 格式，例如 2024-12-20 11:52:13 +0800，这样更标准化。

综上所述，这个提交的改动是合理的，但可以改进的地方是增加更详细的更新描述，并使用 ISO 8601 格式的日期。