Make libtorch CUDA12 builds actually build on CUDA-12 (#105364)
Not sure, why https://github.com/pytorch/pytorch/pull/102178 downgraded this build from CUDA-12.1 down to CUDA-11.8
Hattip to @ptrblck for spotting it.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/105364
Approved by: https://github.com/izaitsevfb, https://github.com/atalman
