drop reliance on 'nvidia' conda channel (#254)

Contributes to rapidsai/build-planning#254

The `nvidia` conda channel should no longer be necessary here.

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

Approvers:
  - https://github.com/jakirkham

URL: #254

Author: jameslamb

conda/environments/all_arch-any.yaml

@@ -4,7 +4,6 @@ channels:
 - rapidsai
 - rapidsai-nightly
 - conda-forge
-- nvidia
 dependencies:
 - jupyterlab>=4.0.0
 - nodejs=18

dependencies.yaml

@@ -46,7 +46,6 @@ channels:
   - rapidsai
   - rapidsai-nightly
   - conda-forge
-  - nvidia
 dependencies:
   build_wheels:
     common: