py-ipykernel: updated to 6.29.3

6.29.3

Enhancements made

- Eventloop scheduling improvements for stop_on_error_timeout and schedule_next

Bugs fixed

- Disable frozen modules by default, add a toggle

Maintenance and upkeep improvements

- Fix typings and update project urls
- Unpin pytest-asyncio and update ruff config

Documentation improvements

- Correct spelling mistake

(adam)