Avoid deprecation warnings in `CHECK_CUDA` (#3854)
The `type()` function is deprecated and `is_cuda()` can be used since about forever.
This avoids MANY warnings when compiling extensions.
Co-authored-by: Logan Adams <114770087+loadams@users.noreply.github.com>
Co-authored-by: Michael Wyatt <michaelwyatt@microsoft.com>
