add 12.9 cuda support

[JacobSzwejbka]

PyTorch has nightly wheels for this

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15818

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures, 2 Unrelated Failures

As of commit 5158f74 with merge base 92bf722 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d
• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t 44e37da3ba58480544f9d0d8d9b081294425d5fb91b6ae15d63e93fa8349c5c5 /exec failed with exit code 1

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)

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[github-actions]

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[larryliu0820]

can you add to CI as well

[larryliu0820]

https://github.com/pytorch/executorch/blob/main/.github/workflows/cuda.yml#L27