Log Message:
py-ipython: updated to 7.9.0

IPython 7.9 is a small release with a couple of improvement and bug fixes.
 - Xterm terminal title should be restored on exit
 - special variables ``_``,``__``, ``___`` are not set anymore when cache size
   is 0 or less.
 - Autoreload should have regained some speed by using a new heuristic logic to
   find all objects needing reload. This should avoid large objects traversal
   like pandas dataframes.
 - Get ready for Python 4.
 - `%env` Magic nonw has euristic to hide potentially sensitive values