Update to PySide6.

It sounds like PySide2 will not be moving to Python 3.11, so we're stuck
on 3.10 without this. Upgrading to a newer Qt also fixes some high DPI
bugs (the file browser dialog for save/load is no longer tiny on 4k).

https://github.com/pyinstaller/pyinstaller/issues/5414 previously
blocked this, but the bug appears to be fixed now.

game/server/app.py

@@ -8,13 +8,13 @@ from . import (
     flights,
     frontlines,
     game,
+    iadsnetwork,
     mapzones,
     navmesh,
     qt,
     supplyroutes,
     tgos,
     waypoints,
-    iadsnetwork,
 )
 from .settings import ServerSettings
 
@@ -34,7 +34,7 @@ app.include_router(waypoints.router)
 app.include_router(iadsnetwork.router)
 
 
-origins = []
+origins = ["file://"]
 if ServerSettings.get().cors_allow_debug_server:
     origins.append("http://localhost:3000")