remove from pytorch-nightly build in CI

Summary:
Pull Request resolved: https://github.com/facebookresearch/d2go/pull/672

Nightly is less stable than d2go itself (eg. issue like https://github.com/facebookresearch/d2go/actions/runs/10135977974), just use the latest build.

Differential Revision: D60458684

fbshipit-source-id: 2cce9a0eaabdeba2908703753d67dcd4bb24c378

.github/workflows/workflows.yaml

@@ -22,7 +22,7 @@ jobs:
 
       - name: Install PyTorch
         run: |
-          conda install pytorch torchvision -c pytorch-nightly
+          conda install pytorch torchvision -c pytorch
           wget https://raw.githubusercontent.com/pytorch/pytorch/master/torch/utils/collect_env.py
           python collect_env.py