fix: use Python 3.11 for docs build to support MCP examples

The build_docs.py script requires Python 3.11+ and processes MCP examples,
so we need Python 3.11 with all extras for proper documentation generation.

Author: ryoppippi

.github/workflows/docs.yml

@@ -17,11 +17,11 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@e92bafb6253dcd438e0484186d7669ea7a8ca1cc # v6.4.3
         with:
-          python-version: "3.9"
+          python-version: "3.11"
           enable-cache: true
 
       - name: Install all dependencies
-        run: uv sync --all-extras --no-extra mcp
+        run: uv sync --all-extras
 
       - name: Build documentation
         run: |