gpui_macros: Enable `extra-traits` feature for `syn` (#14067)

Must enable extra-traits of syn feature to enable Debug trait of
Visibility

Release Notes:

- N/A

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Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>
8a659af82csgj123456 committed on 7/10/2024, 4:32:46 PM· committed by GitHubparent07dc405
1 file changedLine totals unavailable