v2.2.0-windows.post1

Now the wheels are built with the Python Stable ABI (also known as ABI3). This means we no longer need to build a different wheel for every Python version (although in principle we still need to build for every PyTorch and CUDA version). Later I'll make a PR to the official SageAttention repo.

There is cp39-abi3 in the wheel filenames, so they support Python >= 3.9 .

For RTX 20xx (sm75), this wheel will run the Triton kernels. The CUDA kernels for sm75 are bundled for testing but they do not fully work yet.

The wheel for PyTorch 2.8 is stable now.