Remove NumPy <2 pin

[seberg]

This PR removes the NumPy<2 pin which is expected to work for
RAPIDS projects once CuPy 13.3.0 is released (CuPy 13.2.0 had
some issues preventing the use with NumPy 2).

[jakirkham]

Closing and reopening to rerun CI with CuPy 13.3.0 (since it was released earlier today)

[jakirkham]

It is worth noting that there is a cycle in the dependency graph between cuDF requiring Dask-CUDA in its tests and Dask-CUDA requiring cuDF

Unfortunately that means to test either one with NumPy 2, we need to rebuild both with NumPy 2 first. Since it is not possible to rebuild both and test at the same time, we need to pick one to rebuild first so we can test the other

Given Dask-CUDA's library usage of NumPy 2 is relatively simple (wrapping memory and very minor adjustments), rebuilding Dask-CUDA first seems like the safer path. We can then rebuild and test cuDF with NumPy 2 and Dask-CUDA. Once cuDF packages are out we can come back and test Dask-CUDA on NumPy 2 (using a no-op PR to run CI tests and spot checking CI logs for NumPy 2 usage with cuDF)

Leaving this note for completeness about this plan. Will also link the no-op testing PR here

[jakirkham]

Should add, ran a quick sanity check using Ruff's NumPy 2 plugin and it came back clean

% ruff check dask_cuda --select NPY201
All checks passed!

So hopefully that provides us some more confidence (in addition to repeated offline testing done as part of NumPy 2 bringup, CuPy 13.3.0 development, etc.)

[jakirkham]

Thanks Sebastian! 🙏

[jakirkham]

/merge

[jakirkham]

Will use PR ( #1378 ) for testing