change python version in docs generation

sphinx-argparse 0.5.0 dropped support to python 3.9

.github/workflows/docs.yml

@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v3
         with:
-          python-version: "3.9"
+          python-version: "3.10"
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip