Log Message:
py_jupyter_client: updated to 5.2.2

Changes in Jupyter Client 5.2.2
- Fix :meth:.KernelSpecManager.get_all_specs method in subclasses
  that only override :meth:.KernelSpecManager.find_kernel_specs
  and :meth:.KernelSpecManager.get_kernel_spec.
- Eliminate occasional error messages during process exit.
- Improve error message when attempting to bind on invalid address.
- Add missing direct dependency on tornado