Log Message:
py-jupyter_client: updated to 6.1.6

6.1.6
- Removed warnings in more cases for KernelManagers that use new cleanup method
- Some improved tests with a conversion to pytest pattern

6.1.5
- Gracefully Close ZMQ Context upon kernel shutdown to fix memory leak
- Fix for chained exceptions to preserve stacks
- Fix start_kernel error when passing kernel_id
- Update to releasing docs

6.1.4
(Deleted release with incorrect local files)

6.1.3
- Add AsyncKernelClient client_class to AsyncKernelManager
- Doc fix for xeus hyperlinks
- Doc typo fix