Use python 3.9 in launch test instead of 3.8

Fix ruff check.

.github/workflows/test-launch.yml

@@ -17,7 +17,7 @@ jobs:
         path: "ComfyUI"
     - uses: actions/setup-python@v4
       with:
-        python-version: '3.8'
+        python-version: '3.9'
     - name: Install requirements
       run: |
         python -m pip install --upgrade pip

comfy/model_management.py

@@ -87,7 +87,7 @@ except:
     pass
 
 try:
-    import torch_npu
+    import torch_npu  # noqa: F401
     _ = torch.npu.device_count()
     npu_available = torch.npu.is_available()
 except: