Add Python 3.14 to the wheel publishing matrix (#750)

The "Publish packages" workflow still uses the matrix from
`ci/matrix.yml`, which doesn't yet include Python 3.14.

This PR adds Python 3.14 to the matrix with the aim of getting the
workflow to pulish packages to PyPI for Python 3.14 as well. In the long
term this might want to align with the way things work for the rest of
CUDA Python, but this should provide a quick fix for now.

Author: gmarkall

ci/matrix.yml

@@ -9,10 +9,12 @@ build-matrix:
   - { ARCH: 'amd64', PY_VER: '3.11', CUDA_VER: '12.8.0', LINUX_VER: 'rockylinux8' }
   - { ARCH: 'amd64', PY_VER: '3.12', CUDA_VER: '12.8.0', LINUX_VER: 'rockylinux8' }
   - { ARCH: 'amd64', PY_VER: '3.13', CUDA_VER: '12.8.0', LINUX_VER: 'rockylinux8' }
+  - { ARCH: 'amd64', PY_VER: '3.14', CUDA_VER: '12.8.0', LINUX_VER: 'rockylinux8' }
   - { ARCH: 'arm64', PY_VER: '3.10', CUDA_VER: '12.8.0', LINUX_VER: 'rockylinux8' }
   - { ARCH: 'arm64', PY_VER: '3.11', CUDA_VER: '12.8.0', LINUX_VER: 'rockylinux8' }
   - { ARCH: 'arm64', PY_VER: '3.12', CUDA_VER: '12.8.0', LINUX_VER: 'rockylinux8' }
   - { ARCH: 'arm64', PY_VER: '3.13', CUDA_VER: '12.8.0', LINUX_VER: 'rockylinux8' }
+  - { ARCH: 'arm64', PY_VER: '3.14', CUDA_VER: '12.8.0', LINUX_VER: 'rockylinux8' }
 simulator-matrix:
   - { ARCH: 'amd64', PY_VER: '3.12', CUDA_VER: '12.8.0', LINUX_VER: 'rockylinux8' }
 # We test "oldest" dependencies with the oldest supported Python version and