Update Python version installed for GitHub Actions

.github/workflows/docs.yml

@@ -7,9 +7,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - name: Set up Python 3.10
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
       - name: Install dependencies
         run: |
+          pip install .
           pip install -r requirements_docs.txt
       - name: Sphinx build
         run: |