Log Message:
py-ipyparallel: updated to 9.0.0

IPython Parallel 9 is a small major release.

The biggest new feature highlight is Windows support for SSHLauncher.

Fixes:

- Fix for background-thread output going to the wrong cell in a notebook.

Other changes:

- Compatibility fixes for upcoming ipykernel 7 (ipykernel 6.9.1 is now required)
- JupyterLab extension dependencies are updated from 3.x to JupyterLab 4.3
- Use `importlib.metadata` instead of deprecated `entrypoints` (no effect for users)