close pytorch 2.7 migration

[h-vetinari]

In an effort to document these things before closing a migration with a bunch of outstanding PRs, here we are

CC @conda-forge/pytorch-cpu

Ongoing

• Rebuild for pytorch 2.7 torchani-feedstock#47 (persistent osx timeouts, otherwise OK)
• Rebuild for pytorch 2.7 tt-metalium-feedstock#9

Blocked

• Rebuild for pytorch 2.7 abacus-feedstock#63 (needs newer version)
• https://github.com/conda-forge/deepmd-gnn-feedstock (waiting for deepmd-kit)
• Rebuild for pytorch 2.7 deepmd-kit-feedstock#100 (missing compatible tensorflow)
• Rebuild for pytorch 2.7 dgl-feedstock#59 (missing compatible tensorflow)
• Rebuild for pytorch 2.7 horovod-feedstock#27 (missing compatible tensorflow)
• https://github.com/conda-forge/nnpops-feedstock (waiting for torchani)
• Rebuild for pytorch 2.7 torchtext-feedstock#32 (upstream abandoned)

Dead feedstock

• Rebuild for pytorch 2.7 fairscale-feedstock#40
• Rebuild for pytorch 2.7 fcos-feedstock#25
• Rebuild for pytorch 2.7 torchsparse-feedstock#40

[h-vetinari]

This migration has been going for a very long time and #7713 (itself already a few months delayed) is in the wings, so let's pull the trigger here.

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.