[HOTFIX] Changed code to disable k_truss on CUDA 11.4 differently

[rlratzel]

Changed code to disable k_truss on CUDA 11.4 to not use numba.cuda.runtime.get_version() at import time since this creates a CUDA context which breaks dask LocalCUDACluster init (causes a nccl init invalid usage exception).

This code change results in almost the same UX as before, except explicit imports of the k_truss module no longer raise the exception immediately, and instead raise only when a k_truss algo is called.

Tested by ensuring unit tests for the conditional enabling of k_truss still work and also checked that a LocalCUDACluster could properly be created.

See #1811 for reference

[BradReesWork]

@raydouglass you need to merge this since I do not have permissions