Got this crash when upgrading from 2.13.x to 3.0.1 (Flatpak):

```

Traceback (most recent call last):

File "/app/lib/python3.13/site-packages/picard/ui/setupwizard.py", line 534, in accept

page.save_settings(config)

~~~~~~~~~~~~~~~~~~^^^^^^^^

File "/app/lib/python3.13/site-packages/picard/ui/setupwizard.py", line 443, in save_settings

tagger.window._auto_update_check()

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^

File "/app/lib/python3.13/site-packages/picard/ui/mainwindow/_init_.py", line 2213, in _auto_update_check

self._check_for_update(False)

~~~~~~~~~~~~~~~~~~~~~~^^^^^^^

File "/app/lib/python3.13/site-packages/picard/ui/mainwindow/_init_.py", line 2217, in _check_for_update

self.tagger.updatecheckmanager.check_update(

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

AttributeError: 'Tagger' object has no attribute 'updatecheckmanager'

```