Log Message:
py-jupyter_core: updated to 4.6.0

4.6.0
- Unicode characters existing in the user's home directory name are properly
  handled.
- mock is now only required for testing on Python 2.
- Deprecation warnings relative to _runtime_dir_changed are no longer
  produced.
- The scripts directory relative to the current python environment is
  now appended to the search directory for subcommands.
- Some utility functions (exists(), is_hidden(), secure_write())
  have been moved from jupyter_client and jupyter_server to
  jupyter_core.
- Fix error on Windows when setting private permissions