Contributes to rapidsai/build-planning#102

Some RAPIDS libraries are using `ncclCommSplit()`, which was introduced in `nccl==2.18.1.1`. This is part of a series of PRs across RAPIDS updating libraries' pins to `nccl>=2.18.1.1` to ensure they get a new-enough version that supports that.

Authors:
  - James Lamb (https://github.com/jameslamb)

Approvers:
  - Vyas Ramasubramani (https://github.com/vyasr)

URL: #2443

Authors:
  - rhdong (https://github.com/rhdong)

Approvers:
  - Artem M. Chirkin (https://github.com/achirkin)
  - Corey J. Nolet (https://github.com/cjnolet)

URL: #2438

Authors:
  - Victor Lafargue (https://github.com/viclafargue)

Approvers:
  - Corey J. Nolet (https://github.com/cjnolet)

URL: #2431

Follow-up to #2443

As part of the work to support NumPy 2 across RAPIDS, we found reason to upgrade some libraries like `cugraph` to slightly newer NCCL (`>=2.19`). Context: rapidsai/build-planning#102 (comment)

This applies that same bump here, to keep the range of NCCL versions consistent across RAPIDS.

Authors:
  - James Lamb (https://github.com/jameslamb)

Approvers:
  - https://github.com/jakirkham
  - Corey J. Nolet (https://github.com/cjnolet)

URL: #2458

I opted to deprecate just the necessary pieces, such as the `index` classes instead of deprecating every single function.

Authors:
  - Corey J. Nolet (https://github.com/cjnolet)

Approvers:
  - Ben Frederickson (https://github.com/benfred)

URL: #2448