CHG: update to latest pypubsub (3.3.dev1)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@75077 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Update from r343 of pubsub trunk/src/pubsub on SF.net

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@75301 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775