Install Python 3.10 in CI venvs

Author: andresdelfino

.github/workflows/docs.yml

@@ -8,6 +8,8 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v3
+        with:
+          python-version: '3.10'
       - name: Install dependencies
         run: |
           pip install sphinx sphinx_rtd_theme

.github/workflows/pythonapp.yml

@@ -19,10 +19,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.8
+    - name: Set up Python 3.10
       uses: actions/setup-python@v1
       with:
-        python-version: 3.8
+        python-version: '3.10'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip