[MacPorts] #63041: virt-manager: update to 3.2.0, and migrate to python 3.9

[MacPorts]

#63041: virt-manager: update to 3.2.0, and migrate to python 3.9
---------------------+--------------------------
 Reporter:  mascguy  |      Owner:  mascguy
     Type:  update   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  virt-manager
---------------------+--------------------------
 Upstream's latest release is 3.2.0, while our port is still at 2.2.1.

 Let's update, and also migrate to Python 3.9 if possible.

-- 
Ticket URL: <https://trac.macports.org/ticket/63041>
MacPorts <https://www.macports.org/>
Ports system for macOS