Log Message:
ham/chirp: Update to 20230823 and switch to py3 branch

Upstream has had a python3 branch for a long time, which uses
wxWidgets.  The "chirp-daily" py2 branch with py-gtk2 is unmaintained,
and the "chirp-next" py3 branch is the recommended version.  This
commit switches to that branch, but there is no major version change
because upstream uses just dates for all tarballs.  Besides the python
version and toolkit change, installed program names change.

As always there are bugfixes, minor improvements and support for
additional radios.