environment.yml: install pytorch with gpu support by pegging cudatoolkit to max v11.5 (#545)

* environment.yml: peg cudatoolkit to max v11.5

* remove cudatoolkit

Co-authored-by: Wei Ji <23487320+weiji14@users.noreply.github.com>

Co-authored-by: Wei Ji <23487320+weiji14@users.noreply.github.com>

environment.yml

@@ -5,7 +5,6 @@ channels:
   - esri  # for pycocotools. Remove when https://github.com/conda-forge/pycocotools-feedstock/issues/16 is solved
   - open3d-admin  # for open3d
 dependencies:
-  - cudatoolkit
   - einops
   - fiona>=1.5
   - h5py