rnix-hashes: fix tests, add me as maintainer

[SuperSandro2000]

Motivation for this change

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[r-rmcgibbo]

Result of nixpkgs-review pr 119749 at 5de0ca5 run on x86_64-linux 1

1 package built successfully:

• rnix-hashes

1 suggestion:

• warning: missing-patch-comment

  Please add a comment on the line above, explaining the purpose of this patch.
  Near pkgs/tools/nix/rnix-hashes/default.nix:15:5:

     |
  15 |     (fetchpatch {
     |     ^
  

---

Result of nixpkgs-review pr 119749 at 2174552 run on aarch64-linux 1

1 package built successfully:

• rnix-hashes