ci: switch Docker image to nvidia/cuda:12.6.0-devel-rockylinux9
#35
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cupy currently requires development headers that aren't in the "runtime" CUDA Docker images (cupy/cupy#8466). It seems like eventually the plan is to support CUDA from pip (cupy/cupy#8013), and indeed the headers are already available from the
nvidia-cuda-runtime-cu12
on PyPI, but let's not mix and match CUDA sources unless we need to.(Also, let's use Rocky instead of Ubuntu, since most users will probably be on a GPU cluster running a RHEL variant.)