Bump infinity to v0.6.11. Requires python>=3.11 (#11814)

### What problem does this PR solve?

Bump infinity to v0.6.11. Requires python>=3.11

### Type of change

- [x] Refactoring

docs/develop/launch_ragflow_from_source.md

@@ -41,13 +41,19 @@ cd ragflow/
    pipx install uv
    ```
 
-2. Install Python dependencies:
+2. Install RAGFlow service's Python dependencies:
 
    ```bash
-   uv sync --python 3.10 # install RAGFlow dependent python modules
+   uv sync --python 3.11 --frozen
    ```
    *A virtual environment named `.venv` is created, and all Python dependencies are installed into the new environment.*
 
+   If you need to run tests against the RAGFlow service, install the test dependencies:
+
+   ```bash
+   uv sync --python 3.11 --group test --frozen && uv pip install sdk/python --group test
+   ```
+
 ### Launch third-party services
 
 The following command launches the 'base' services (MinIO, Elasticsearch, Redis, and MySQL) using Docker Compose:

docs/develop/mcp/launch_mcp_server.md

@@ -176,7 +176,7 @@ This section is contributed by our community contributor [yiminghub2024](https:/
    iii. Copy [docker/entrypoint.sh](https://github.com/infiniflow/ragflow/blob/main/docker/entrypoint.sh) locally.  
    iv. Install the required dependencies using `uv`:  
        - Run `uv add mcp` or
-       - Copy [pyproject.toml](https://github.com/infiniflow/ragflow/blob/main/pyproject.toml) locally and run `uv sync --python 3.10`.
+       - Copy [pyproject.toml](https://github.com/infiniflow/ragflow/blob/main/pyproject.toml) locally and run `uv sync --python 3.11`.
 2. Edit **docker-compose.yml** to enable MCP (disabled by default).
 3. Launch the MCP server: