hangups: Update chat/py-hangups to 0.4.4

pkgsrc changes:
- Update some DEPENDS PKGVERSIONs to reflect upstream setup.py changes

Changes:
* fix error when updating read timestamp for empty conversation
* fix HTTP client resource management issue
* add alternate up/down keybindings
* add terminal bell notification method
* add --notification-type option, deprecate --disable-notifications
* fix exception propagation issues in UI

(leot)