Log Message:
py-ipykernel: updated to 5.1.2

5.1.2
5.1.2 fixes some socket-binding race conditions that caused testing failures in
nbconvert.
- Fix socket-binding race conditions
- Add a no-op ``flush`` method to ``DummySocket`` and comply with stream API
- Update kernel version to indicate kernel v5.3 support
- Add testing for upcoming Python 3.8 and PEP 570 positional parameters