- Update to version 6.0+git20230913.0f036f0b:
* better backwards compatibility
* #3956 prefer Gtk.StatusIcon on every X11 desktop except gnome
* restore 'help' handling for video options
* minor ruff warnings
* forgot to include the cuda build script
* unbreak the CI
* #3808 build CUDA kernels in advance
* move check to a function
* require Cython 3 (fix check)
* #3995 send the modified packet
* don't setup ssh agent forwarding when proxing
* no more string vs bytes problems here
* simplify adding the 'Compressed' wrapper
* doh: use the new-value supplied
* use dedicated flag for pings
* #3956 try Gtk.StatusIcon first on non-gnome/kde xorg sessions
* simplify: use lists without None values
* cannot follow a tray
* remove unused subclass
* #3995 match new exception type
* support prefixed encoding caps
* don't send cursors without a matching encoding
* #3999 safer automatic recursion
* all supported versions have these features
* Refactor pulseaudio '--load=module arg1=value1 ...' option creation
* Create Xpra-Mic-Source pulseaudio remapped source for Chromium
* Fix computation of microphone_enabled when "on:device" flag is provided
* Parse "Monitor of Sink" instead of device.class when it is not reported
* Clear props before processing each pactl output block unconditionally