nix: fix nix develop .#python-scripts (#19218)

nix: fix nix develop .#python-scripts (#19218)

Without this I get:

> * Getting build dependencies for wheel...
> * Building wheel...
> Successfully built gguf-0.17.1-py3-none-any.whl
> Finished creating a wheel...
> Finished executing pypaBuildPhase
> Running phase: pythonRuntimeDepsCheckHook
> Executing pythonRuntimeDepsCheck
> Checking runtime dependencies for gguf-0.17.1-py3-none-any.whl
>   - requests not installed
For full logs, run:
    nix log /nix/store/x0c4a251l68bvdgang9d8v2fsmqay8a4-python3.12-gguf-0.0.0.drv

I changed a bit the style to make it more terse ~> more elegant in my
opinion.