f78506161d
A recent dependency change caused the tests running on GitHub Actions
under Python 3.10.5 on Windows to fail when starting pytest run:
...
INTERNALERROR> File "<frozen importlib._bootstrap>", line 123, in acquire
INTERNALERROR> KeyError: xxxx
The cause seems to have been a newer version of chardet package released
recently.
* Fixed by pinning chardet to v4
* Also pin Windows version to 2019 to match packaging workflow
See-also: https://github.com/deluge-torrent/deluge/actions/runs/2578427588
Issue: https://github.com/chardet/chardet/issues/265