Update hardcoded WIN-CUDA from 11.1 with 11.3

Also, remove reference to conda-forge, all CUDA toolchain should be
available from NVIDIA channel

Author: malfet

.circleci/config.yml

@@ -848,7 +848,7 @@ jobs:
     executor:
       name: windows-gpu
     environment:
-      CUDA_VERSION: "11.1"
+      CUDA_VERSION: "11.3"
       PYTHON_VERSION: << parameters.python_version >>
     steps:
       - checkout

.circleci/config.yml.in

@@ -28,7 +28,7 @@ else
 fi
 
 printf "Installing PyTorch with %s\n" "${cudatoolkit}"
-conda install -y -c "pytorch-${UPLOAD_CHANNEL}" -c conda-forge "pytorch-${UPLOAD_CHANNEL}"::pytorch[build="*${version}*"] "${cudatoolkit}" pytest
+conda install -y -c "pytorch-${UPLOAD_CHANNEL}" -c nvidia "pytorch-${UPLOAD_CHANNEL}"::pytorch[build="*${version}*"] "${cudatoolkit}" pytest
 
 torch_cuda=$(python -c "import torch; print(torch.cuda.is_available())")
 echo torch.cuda.is_available is $torch_cuda