chore: Remove clap3 dependency by disabling default features of cbindgen (#15037)

cbindgen pulled that in, but we don't really need it (Plus it pulls in a
dep with an advisory)

Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

crates/gpui/Cargo.toml

@@ -87,7 +87,7 @@ embed-resource = "2.4"
 
 [target.'cfg(target_os = "macos")'.build-dependencies]
 bindgen = "0.65.1"
-cbindgen = "0.26.0"
+cbindgen = { version = "0.26.0", default-features = false }
 
 [target.'cfg(target_os = "macos")'.dependencies]
 block = "0.1"