build(nix): fix Darwin-to-Darwin builds #200

Job	Run time
cargo audit	44s
wit-deps-aarch64-unknown-linux-musl	6m 3s
cargo fmt	41s
build-doc	4m 23s
wit-deps-aarch64-apple-darwin	4m 54s
cargo clippy	1m 37s
wit-deps-armv7-unknown-linux-musleabihf	6m 2s
cargo nextest	1m 37s
wit-deps-x86_64-apple-darwin	4m 24s
wit-deps-x86_64-pc-windows-gnu	7m 58s
wit-deps-x86_64-unknown-linux-musl	5m 1s
deploy-doc	0s
wit-deps-universal-darwin	18s
oci	0s
release	0s
	43m 42s

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