Dan Albert 2a75d14e0e Revert upgrade to pyside6.
This appears to be incompatible with pyinstaller. I get the following
when trying to run the executable generated with pyside6:

```
Traceback (most recent call last):
  File "qt_ui\main.py", line 29, in <module>
  File "PyInstaller\loader\pyimod03_importers.py", line 476, in exec_module
  File "qt_ui\windows\QLiberationWindow.py", line 28, in <module>
  File "PyInstaller\loader\pyimod03_importers.py", line 476, in exec_module
  File "qt_ui\widgets\map\QLiberationMap.py", line 11, in <module>
ImportError: could not import module 'PySide6.QtPrintSupport'
```
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