pytorch 2.6 migration

[h-vetinari]

The 2.6 migration started, and it's looking like it'll be a lot of manual work. First off, we got phantom parents holding up things, then there are a bunch of conflicts due to feedstocks still building CUDA 11.8 (which needs to be dropped), plus some assorted other stuff. Compare also conda-forge/conda-forge-pinning-feedstock#7031.

Done

• Rebuild for pytorch 2.6 autoawq-feedstock#28
• Rebuild for pytorch 2.6 carterbox-torch-radon-feedstock#17
• Rebuild for pytorch 2.6 fairseq-feedstock#44
• flash-attn v2.7.4 + Rebuild for pytorch 2.6 flash-attn-feedstock#33
• Rebuild for pytorch 2.6 inplace-abn-feedstock#16
• Rebuild for pytorch 2.6 libmetatensor-torch-feedstock#15
• Rebuild for pytorch 2.6 momentum-feedstock#116
• Rebuild for pytorch 2.6 nnpops-feedstock#45
• Rebuild for pytorch 2.6 norse-feedstock#22
• Rebuild for pytorch 2.6 nvidia-apex-feedstock#52
• Rebuild for pytorch 2.6 openmm-torch-feedstock#61
• Rebuild for pytorch 2.6 pixsfm-feedstock#32
• Rebuild for pytorch 2.6 pytorch_scatter-feedstock#68
• Rebuild for pytorch 2.6 pytorch_sparse-feedstock#70
• Rebuild for pytorch 2.6 pytorch_spline_conv-feedstock#42
• Rebuild for pytorch 2.6 pytorch3d-feedstock#25
• Rebuild for pytorch 2.6 pytorchrl-feedstock#8
• Rebuild for pytorch 2.6 sam-2-feedstock#17
• Rebuild for pytorch 2.6 sinabs-exodus-feedstock#16
• Rebuild for pytorch 2.6 tensordict-feedstock#21
• Rebuild for pytorch 2.6 theseus-ai-feedstock#25
• Rebuild for pytorch 2.6 torch-scatter-feedstock#37
• Rebuild for pytorch 2.6 torchani-feedstock#45
• Rebuild for pytorch 2.6 torchdata-feedstock#39
• Rebuild for pytorch 2.6 torchmd-net-feedstock#50
• Rebuild for pytorch 2.6 torchopt-feedstock#9
• Rebuild for pytorch 2.6 torchsort-feedstock#6
• Rebuild for pytorch 2.6 torchvision-feedstock#115 (phantom parent; handled by conda-forge/conda-forge-pinning-feedstock@9657b7e)
• Rebuild for pytorch 2.6 torchvision-extra-decoders-feedstock#1
• Rebuild for pytorch 2.6 xformers-feedstock#45

In progress

• Rebuild for pytorch 2.6 abacus-feedstock#55
• Rebuild for pytorch 2.6 aihwkit-gpu-feedstock#22
• Rebuild for pytorch 2.6 auto_gptq-feedstock#15
• Rebuild for pytorch 2.6 deepspeed-feedstock#83
• Rebuild for pytorch 2.6 detectron2-feedstock#49
• Rebuild for pytorch 2.6 fcos-feedstock#24
• Rebuild for pytorch 2.6 kaolin-feedstock#36
• Rebuild for pytorch 2.6 mmcv-recipe-feedstock#39
• Rebuild for pytorch 2.6 pytorch_cluster-feedstock#60
• Rebuild for pytorch 2.6 torch-harmonics-feedstock#11
• Rebuild for pytorch 2.6 torchtext-feedstock#28

Blocked by conda-forge/tensorflow-feedstock#419

• Rebuild for pytorch 2.5 & tensorflow 2.18 deepmd-kit-feedstock#90 / Rebuild for pytorch 2.6 deepmd-kit-feedstock#92
• Rebuild for pytorch 2.5 dgl-feedstock#53 / Rebuild for pytorch 2.6 dgl-feedstock#54
• Rebuild for pytorch 2.5 & tensorflow 2.18 horovod-feedstock#20 / Rebuild for pytorch 2.6 horovod-feedstock#22

Blocked for other reasons

• Rebuild for pytorch 2.5 pyg-lib-feedstock#32 (affected by CMake metadata for CUDA builds not yet self-contained #357) / Rebuild for pytorch 2.6 pyg-lib-feedstock#34
• Rerender torchaudio-feedstock#15 (blocked by kaldi's rebuild for CUDA 12.6)

Dead feedstock (or no compatibility with new pytorch)

• Rebuild for pytorch 2.6 fairscale-feedstock#38
• Rebuild for pytorch 2.6 torchsparse-feedstock#39

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