Drop Dart SDK requirement to v3.9.0

[mark-dropbear]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @mark-dropbear, 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 adjusts the project's dependency configuration to decrease the minimum required Dart SDK version. This modification enhances the package's compatibility, enabling its use with earlier patch versions within the Dart 3.9.x series, specifically from 3.9.0 onwards.

Highlights

• Dart SDK Version: The minimum required Dart SDK version has been lowered from 3.9.3 to 3.9.0 in both the pubspec.yaml and pubspec.lock files.

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[gemini-code-assist]

Code Review

This pull request lowers the minimum Dart SDK requirement from 3.9.3 to 3.9.0. This is a beneficial change that broadens the package's compatibility. The changes in pubspec.yaml and pubspec.lock are consistent and correctly reflect this intent. However, this change introduces a potential risk, as detailed in the comment below. For future contributions, please consider adding a brief description to the pull request explaining the rationale for the changes to improve project maintainability.