Merge pull request #96 from Subaru-PFS/u/monodera/add_python_actions

add setup-python to GitHub Actions

.github/workflows/deploy_docs.yml

@@ -12,8 +12,13 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Set-up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
       - name: Install dependencies
-        run: pip install mkdocs "mkdocs-material[imaging]"
+        run: pip install -U mkdocs "mkdocs-material[imaging]"
 
       - name: Build and deploy documentation
         run: mkdocs build --site-dir ${{ vars.DOC_PATH }}