updated Python version to 3.13 in GitHub Actions workflow

Author: rongxin-liu

.github/workflows/main.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.12'
+          python-version: "3.13"
 
       - name: Build for linux/amd64
         uses: docker/build-push-action@v5
@@ -56,7 +56,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.12'
+          python-version: "3.12"
 
       - name: Build for linux/arm64
         uses: docker/build-push-action@v5
@@ -122,4 +122,4 @@ jobs:
                   workflow_id: 'main.yml',
                   ref: 'main'
                 });
-            }
+            }