Upgrade python to 3.9 in publish.yaml

.github/workflows/publish.yaml

@@ -42,10 +42,10 @@ jobs:
       - uses: actions/checkout@master
       - name: Pull latest changes
         run: git pull origin main
-      - name: Set up Python 3.8
+      - name: Set up Python 3.9
         uses: actions/setup-python@v3
         with:
-          python-version: 3.8
+          python-version: 3.9
       - name: Configure aws credentials
         uses: aws-actions/configure-aws-credentials@v2
         with: