[omath]: update to 4.4.0

[luadebug]

• Before adding new features and new modules, please go to issues to submit the relevant feature description first.
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• Please commit code to dev branch and we will merge into master branch in feature
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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 @luadebug, 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 focuses on a routine maintenance update, specifically upgrading the omath package to its latest version, 4.4.0. This ensures the project benefits from the most recent features, bug fixes, and performance enhancements provided by the omath library, keeping our dependencies current and robust.

Highlights

• omath Package Update: The omath package has been updated to version 4.4.0 by adding its version and corresponding commit hash to the xmake.lua configuration.

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[gemini-code-assist]

Code Review

This pull request updates the omath package to version 4.4.0. The change adds the new version and its corresponding SHA256 hash to the xmake.lua package definition file. The new version is correctly placed at the top of the versions list, maintaining the descending order. The change is straightforward and follows the established conventions for this repository. I have reviewed the changes and found no issues.