Log Message:
py-ipykernel: updated to 5.4.0

5.4.0 is generally focused on code quality improvements and tornado asyncio \ 
compatibility.
- Add github actions, bail on asyncio patch for tornado 6.1.
- Start testing on Python 3.9.
- Fix stack levels for ipykernel's deprecation warnings and stop using some \ 
deprecated APIs.
- Add env parameter to kernel installation
- Fix stop_on_error_timeout blocking other messages in queue.
- Remove most of the python 2 compat code.
- Remove u-prefix from strings