Tried rattler on a recipe, failed on a few fronts

[adrinjalali]

I had an issue with one of the packages on conda-forge and needed to do some manual work, so I though I'd give rattler a try too, while following https://prefix.dev/blog/rattler_build_on_conda_forge after re-creating my meta.yaml with grayskull. A few issues appeared:

• I was expecting to be able to directly create this with grayskull, or any other tool, rather than having to first create the old format with grayskull, and then convert it to the new format.
• I first couldn't create the new format cause deps don't seem to support py3.13 yet, and my env was with py3.13
• after conversion, conda-forge kept complaining, so I rolled back: new build system conda-forge/skops-feedstock#12