Remove warning about PyTorch

[simonw]

llm/docs/setup.md

Lines 38 to 40 in d075336

	## A note about Homebrew and PyTorch
	The version of LLM packaged for Homebrew currently uses Python 3.12. The PyTorch project do not yet have a stable release of PyTorch for that version of Python.

This is no longer true. PyTorch can be installed in Python 3.12 now, even though it isn't fully supported yet according to:

• https://github.com/pytorch/pytorch/releases/tag/v2.3.0
• Torch compile does not work on python 3.12 pytorch/pytorch#120233

It sounds like full support is for 3.12 is coming in PyTorch 2.4.

There's another tracking ticket for Python 3.13 support here:

• Python 3.13 support for PyTorch pytorch/pytorch#130249

[simonw]

Before I update the docs I'll check llm-sentence-transformers installs cleanly on the Homebrew version.

But... that's blocked on Homebrew releasing a new build that includes this fix:

• "AttributeError: module 'numpy' has no attribute 'int8'" on fresh brew install #531

[simonw]

I'll remove the warning as soon as I have demonstrated llm install llm-sentence-transformers working on a fresh Homebrew installation.