.github: pin flutter version 3.27.4

[wfleischer]

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[gemini-code-assist]

Summary of Changes

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This pull request standardizes the Flutter SDK version used by the project to 3.27.4. This change ensures that all development environments use a consistent Flutter version, which can help prevent compatibility issues and ensure predictable build outcomes.

Highlights

• Flutter Version Pinning: The project's Flutter SDK version has been explicitly pinned to 3.27.4 in pubspec.yaml.
• Dependency Lock File Update: The pubspec.lock file has been updated to reflect the new minimum Flutter SDK version constraint, aligning with the pinned version.

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[gemini-code-assist]

Code Review

This pull request pins the Flutter SDK version to 3.27.4 by updating pubspec.yaml and pubspec.lock. This is a good practice for ensuring consistent builds. I have one suggestion regarding the version constraint in pubspec.yaml to allow for more flexibility with non-breaking patch releases. Please note that while the PR title mentions .github, the changes are in the root project files, which is the correct location for this kind of modification.