Build Monarch with CUDA 12.8 instead of 12.9

Author: ebsmothers

.github/workflows/build_wheels.yaml

@@ -31,11 +31,11 @@ jobs:
             {
               "python_version": "3.10",
               "gpu_arch_type": "cuda",
-              "gpu_arch_version": "12.9",
-              "desired_cuda": "cu129",
-              "container_image": "pytorch/manylinux2_28-builder:cuda12.9",
+              "gpu_arch_version": "12.8",
+              "desired_cuda": "cu128",
+              "container_image": "pytorch/manylinux2_28-builder:cuda12.8",
               "package_type": "manywheel",
-              "build_name": "manywheel-py3_10-cuda12_9",
+              "build_name": "manywheel-py3_10-cuda12_8",
               "validation_runner": "linux.4xlarge.nvidia.gpu",
               "installation": "pip3 install --pre torch torchvision torchaudio --index-url https://download.pytorch.org/whl/nightly/cu129",
               "channel": "nightly",