.github/darwin: Exclude nitro crate

The nitro workspace member is not supported on macOS and has
Linux-exclusive dependencies. Exclude the crate when running
clippy on macOS.

Signed-off-by: Tyler Fanelli <[email protected]>

Author: tylerfanelli

.github/workflows/code_quality-aarch64-darwin.yml

@@ -29,4 +29,4 @@ jobs:
         run: cargo fmt -- --check
 
       - name: Formatting (rustfmt)
-        run: cargo clippy --features efi,gpu -- -D warnings
+        run: cargo clippy --workspace --exclude nitro --features efi,gpu -- -D warnings