Update deploy.yml to Python 3.9

.github/workflows/deploy.yml

@@ -11,10 +11,10 @@ jobs:
     - uses: actions/checkout@v3
       with:
         fetch-depth: 0
-    - name: Set up Python 3.7
+    - name: Set up Python 3.9
       uses: actions/setup-python@v3
       with:
-        python-version: 3.7
+        python-version: 3.9
     - name: Install wheel
       run: >-
         pip install wheel