Use curl in bug-report.yml

`wget` often isn't available on macOS. `curl` is typically available on both macOS and Linux.

Author: dbort

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -35,7 +35,7 @@ body:
     description: |
       Please run the following and paste the output below.
       ```sh
-      wget https://raw.githubusercontent.com/pytorch/pytorch/main/torch/utils/collect_env.py
+      curl -O https://raw.githubusercontent.com/pytorch/pytorch/main/torch/utils/collect_env.py
       # For security purposes, please check the contents of collect_env.py before running it.
       python collect_env.py
       ```