Expand CUDA wheel matrix to run on Ubuntu and Windows - #1

The CUDA wheels workflow was only scheduling Windows builds from the matrix definition. This change expands the OS dimension so the same CUDA/Python matrix executes on both Ubuntu and Windows.

• Matrix scope update

  • In build-wheels-cuda.yaml, the define_matrix job now emits both Linux and Windows runners for the os axis.
  • Existing CUDA (13.2.1, 12.4.1) and Python (3.9) axes are unchanged.

• Behavioral impact

  • build_wheels fan-out now includes Ubuntu and Windows permutations, enabling cross-OS CUDA wheel coverage from one dispatch.

$matrix = @{
    'os' = @('ubuntu-22.04', 'windows-2022')
    'pyver' = @("3.9")
    'cuda' = @("13.2.1", "12.4.1")
    'releasetag' = @("basic")
}