unordered_dense: add v4.6.0 & v4.7.0

[apocelipes]

• Before adding new features and new modules, please go to issues to submit the relevant feature description first.
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---

• 增加新特性和新模块之前，请先到issues提交相关特性说明，经过讨论评估确认后，再进行相应的代码提交，避免做无用工作。
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[gemini-code-assist]

Summary of Changes

Hello @apocelipes, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request aims to expand the available versions of the unordered_dense library within the project's build environment. By updating the xmake.lua configuration, it enables the use of v4.6.0 and v4.7.0, ensuring that developers can leverage the latest features and improvements from this dependency.

Highlights

• New unordered_dense versions: Added support for unordered_dense library versions v4.6.0 and v4.7.0 to the build system.
• Build configuration update: The xmake.lua configuration file for the unordered_dense package has been updated to include the new version entries and their respective commit hashes.

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[gemini-code-assist]

Code Review

This pull request adds versions v4.6.0 and v4.7.0 for the unordered_dense package. The changes also reorder the existing versions. While sorting is a good improvement for maintainability, I've suggested sorting them in descending order to make it easier to identify the latest version. Overall, a good and straightforward update.