Avoid DeprecationWarning in cupy dispatch registration

[wence-]

In cupy 12 and above, cusparse should be imported from cupyx, not cupy itself.

• Tests added / passed
• Passes pre-commit run --all-files

[pentschev]

I can confirm this resolves the issue described in rapidsai/dask-cuda#1174. Thanks @wence- !

[github-actions]

Unit Test Results

See test report for an extended history of previous test failures. This is useful for diagnosing flaky tests.

       26 files  ±0         26 suites  ±0   15h 51m 9s ⏱️ + 2m 39s
  3 600 tests ±0    3 493 ✔️ +1     105 💤 ±0  2 ❌  - 1 
45 553 runs  ±0  43 389 ✔️ +3  2 162 💤  - 2  2 ❌  - 1 

For more details on these failures, see this check.

Results for commit ac0dea2. ± Comparison against base commit 693ad9d.

[quasiben]

Thanks all. Merging in

[jakirkham]

This MatDescriptor serialization code was a workaround for a CuPy pre-8.0.0 issue ( cupy/cupy#3061 ). It was fixed in PR ( cupy/cupy#3157 ).

Maybe for newer CuPy's we skip this workaround. Alternatively we could just drop this workaround and request users have at least CuPy >=8.0.0 installed.

Edit: Maybe the dask & cuda serializers are still of some value. Though it might be worth checking if dask & cuda serialization would be preserved for CuPy sparse matrices when just using pickle for MatDescriptor

Thoughts?

[charlesbluca]

Alternatively we could just drop this workaround and request users have at least CuPy >=8.0.0 installed.

Worth noting that with dask/dask#10161, we now make some attempt to test and document the minimum versions of various optional dependencies here; I intentionally kept that PR focused to CPU dependencies, but could be worth incorporating some form of mindeps testing into our GPU CI matrix so that we can document dependencies like this as well