Rebuild shader header when cbindgen sources have changed (#4051)

This was causing the Metal shaders to incorrectly interpret the
primitives submitted by GPUI, which in turn caused rendering to be
completely borked.

Release Notes:

- N/A
1da9c8b1e9Antonio Scandurra committed on 1/15/2024, 3:32:09 PM· committed by GitHubparentsef4831b0ff5603
1 file changedLine totals unavailable