Cycles: Add Blackwell to Cycles CUDA binaries architectures

Enables building of a Cubin for GPUs based on Blackwell architecture
if CUDA toolkit version 12.8 or higher is installed.
Only added sm_120 to the default set, since it is the one relevant for
consumer GPUs (RTX 5090 etc.) that are generally used with Blender.

Pull Request: https://projects.blender.org/blender/blender/pulls/134170