Add pixi version to system requirements about pixi

[ruben-arts]

I like this idea!

Note that the system requirements are mostly lower bound only.

[system-requirements]
pixi = "<=0.25.0"
cuda = "<=12.1" # Errors

But that might not be a huge problem. As it is non standard anyway.

[tdejager]

Do you mean like a pinned version, or a minimum required version? :)

[pablovela5620]

I think a pinned version, but maybe both? not sure the best way to handle it. I can give a concrete example

Nerfstudio has the following pixi.toml https://github.com/nerfstudio-project/nerfstudio/blob/main/pixi.toml

using 0.28.2 this fails for me and I get

pixi install
  ⠠ default:linux-64     [00:00:01] resolving tomli==2.0.1                                                                                                                                                          × failed to solve the pypi requirements of 'default' 'linux-64'
  ├─▶ failed to resolve pypi dependencies
  ├─▶ Failed to download and build `fire==0.6.0`
  ├─▶ Failed to install requirements from build-system.requires (install)
  ├─▶ Failed to prepare distributions
  ├─▶ Failed to fetch wheel: setuptools==69.5.1
  ├─▶ Failed to extract archive
  ╰─▶ Invalid gzip header

but with 0.25.0 it resolves no problem

[pablovela5620]

Yes, this exactly would be perfect!