Jupyter notebook is not working

## 🐛 Bug

Jupyter notebook is not working on kaggle/python-gpu-build.

### To Reproduce

`docker run -p 8888:8888 --rm -it kaggle/python-gpu-build jupyter notebook --no-browser --ip="0.0.0.0" --allow-root`
When I accessed the URL, it showed "A Jupyter Server is running."

### Additional context

Error log here.
```
[W 2023-10-22 03:16:16.732 ServerApp] notebook | extension failed loading with message: ExtensionLoadingError('_load_jupyter_server_extension function was not found.')
Traceback (most recent call last):
File "/opt/conda/lib/python3.10/site-packages/jupyter_server/extension/manager.py", line 356, in load_extension
extension.load_all_points(self.serverapp)
File "/opt/conda/lib/python3.10/site-packages/jupyter_server/extension/manager.py", line 228, in load_all_points
return [self.load_point(point_name, serverapp) for point_name in self.extension_points]
File "/opt/conda/lib/python3.10/site-packages/jupyter_server/extension/manager.py", line 228, in
return [self.load_point(point_name, serverapp) for point_name in self.extension_points]
File "/opt/conda/lib/python3.10/site-packages/jupyter_server/extension/manager.py", line 219, in load_point
return point.load(serverapp)
File "/opt/conda/lib/python3.10/site-packages/jupyter_server/extension/manager.py", line 146, in load
loader = self._get_loader()
File "/opt/conda/lib/python3.10/site-packages/jupyter_server/extension/manager.py", line 115, in _get_loader
loader = get_loader(loc)
File "/opt/conda/lib/python3.10/site-packages/jupyter_server/extension/utils.py", line 47, in get_loader
raise ExtensionLoadingError(msg) from None
jupyter_server.extension.utils.ExtensionLoadingError: _load_jupyter_server_extension function was not found.
```

使用提供的 docker run 命令作為入口點，在 kaggle/python-gpu-build 中重現此失敗。先從 /opt/conda/lib/python3.10/site-packages 下的 Jupyter Server 擴充功能錯誤開始，接著確認 notebook 能在沒有擴充功能載入錯誤的情況下開啟；issue 未指出任何原始檔案或測試。

由索引模型根據 Issue 內容生成。