Use fetch instead of curl during CI on FreeBSD
Use fetch instead of curl during CI on FreeBSD

carllerche/nix-rust,nix-rust/nix,asomers/nix,geofft/nix-rust,geofft/nix-rust,nix-rust/nix,geofft/nix-rust,carllerche/nix-rust,carllerche/nix-rust,asomers/nix