Running `pip install patchvec[cpu]` does not select cpu-only requirements

[rodrigopitanga]

Evidence:

Collecting patchvec[cpu]
  Downloading patchvec-0.5.6-py3-none-any.whl.metadata (3.6 kB)
WARNING: patchvec 0.5.6 does not provide the extra 'cpu'
[...]
Collecting nvidia-cuda-nvrtc-cu12==12.8.93 (from torch>=1.11.0->sentence-transformers>=2.7.0->patchvec[cpu])
  Downloading nvidia_cuda_nvrtc_cu12-12.8.93-py3-none-manylinux2010_x86_64.manylinux_2_12_x86_64.whl.metadata (1.7 kB)
[...]
Collecting faiss-cpu>=1.7.1.post2 (from txtai>=6.3.0->patchvec[cpu])
  Downloading faiss_cpu-1.12.0-cp313-cp313-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl.metadata (5.1 kB)
[...]