Auto-update libimagequant to 4.4.1

[waruqi]

New version of libimagequant detected (package version: 2.15.1, last github version: 4.4.1)

[gemini-code-assist]

Summary of Changes

Hello @waruqi, 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 integrates the latest stable version of the libimagequant library, version 4.4.1, into the project's build system. This update ensures that the project can leverage the most recent features, performance improvements, and bug fixes provided by the upstream library.

Highlights

• Library Update: The libimagequant library has been updated to version 4.4.1, making this newer release available for use within the project.

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[gemini-code-assist]

Code Review

This pull request provides an automated update for the libimagequant package to version 4.4.1. The change correctly introduces the new version and its corresponding checksum into the package definition file. The modification is straightforward and aligns with the project's conventions for version management. The code appears correct, and I have no further suggestions.