FindCUDAToolkit: Add support for CUDA::nvrtc_static

CUDA 11.5 introduced the nvrtc_static library. Due to oversights I didn't notice this new library so adding support for it now.

The static linking rules are derived from the nvrtc build instructions at:

• https://docs.nvidia.com/cuda/archive/11.5.0/nvrtc/index.html#host-type-name-build-instruction
• https://docs.nvidia.com/cuda/nvrtc/index.html#lto-build-instruction