Bumping up Python from 3.8 to 3.9 in wf yaml.

Author: githubsgi

.github/workflows/main_distributed.yaml

@@ -17,10 +17,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.8
+    - name: Set up Python 3.9
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: 3.9
     - name: Install PyTorch
       uses: astral-sh/setup-uv@v6
     - name: Run Tests