CI deploy: bump Python to 3.10 (#131)

.github/workflows/deploy.yml

@@ -18,10 +18,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.8
+    - name: Set up Python 3.10
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: "3.10"
 
     - name: Install dependencies
       run: |