Arch Linux

Description
===========

anki fails to start with the following error

```
Traceback (most recent call last):
File "/usr/bin/anki", line 3, in <module>
import aqt
File "/usr/lib/python3.9/site-packages/aqt/__init__.py", line 44, in <module>
from aqt.main import AnkiQt # isort:skip
File "/usr/lib/python3.9/site-packages/aqt/main.py", line 22, in <module>
import aqt.mediasrv
File "/usr/lib/python3.9/site-packages/aqt/mediasrv.py", line 16, in <module>
import flask
File "/usr/lib/python3.9/site-packages/flask/__init__.py", line 7, in <module>
from .app import Flask
File "/usr/lib/python3.9/site-packages/flask/app.py", line 19, in <module>
from werkzeug.local import ContextVar
ImportError: cannot import name 'ContextVar' from 'werkzeug.local' (/usr/lib/python3.9/site-packages/werkzeug/local.py)
```

because of the following upgrade.

```
python-flask (1.1.2-4 -> 2.0.0-1)
```

I can assert this because when downgrading that package. anki can be executed without any problems.

```
$ doas pacman -U /var/cache/pacman/pkg/python-flask-1.1.2-4-any.pkg.tar.zst
$ anki
```

Additional info
===============

* package version(s):

The error occurs with the following versions

```
$ pacman -Q -i anki | grep 'Version'
Version : 2.1.35-3
$ pacman -Q -i python-flask | grep 'Version'
Version : 2.0.0-1
```

The error doesn't occur with the following versions

```
> pacman -Q -i anki | grep 'Version'
Version : 2.1.35-3
> pacman -Q -i python-flask | grep 'Version'
Version : 1.1.2-4
```

Steps to reproduce
==================

1. Upgrade your system.

2. Open a Python shell and execute the command shown below. This
command is what anki executes during startup and that's why anki
fails to start.

```
>>> from werkzeug.local import ContextVar
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: cannot import name 'ContextVar' from 'werkzeug.local' (/usr/lib/python3.9/site-packages/werkzeug/local.py)
```