Log Message:
py-zmq: updated to 19.0.2

19.0.2
- Regenerate Cython sources with 0.29.21 in sdists for compatibility with Python 3.9
- Handle underlying socket being closed in ZMQStream with warning instead of error
- Improvements to socket cleanup during process teardown
- Fix debug-builds on Windows
- Avoid importing ctypes during startup on Windows
- Documentation improvements
- Raise ``AttributeError`` instead of ``ZMQError(EINVAL)`` on attempts to read \ 
write-only attributes,
  for compatibility with mocking