nix: update flake for rust 1.72

[aqrln]

• nix: update flake for rust 1.72

[codspeed-hq]

CodSpeed Performance Report

Merging #4170 will not alter performance

_{Comparing rust-1.72-nix (d71b976) with main (08cc777)}

Summary

✅ 11 untouched benchmarks

[tomhoule]

@aqrln I tracked the error and I think current nixpkgs is broken because of cargo-auditable, it should be fixed when NixOS/nixpkgs#248957 lands. In the meantime, #4183 should be mergeable.

[aqrln]

thank you for figuring it out!