ci: Switch flake8 and isort for ruff

[marksweb]

This switches our linting from flake8 and isort to ruff.

[marksweb]

@fsbraun I don't know too much about this stacklevel attribute, but this is the only change that I can see here that's anywhere near the test failure.

And the test failing runs this function to try to register a versionable model with admin (I think that's the idea here at least). That test code is here;
https://github.com/django-cms/djangocms-versioning/blob/master/tests/test_admin.py#L334

[fsbraun]

@marksweb I've also added ruff to #326.

And right, I remember now: When I added stacklevel=2 (I think CodeQL complained) the test_admin.py stated failing. I changed the test which checks if this warning is issued, including comparing the stack level parameter.

See changed test here:

djangocms-versioning/tests/test_admin.py

Lines 357 to 360 in eaf5e9d

	with patch.object(warnings, "warn") as mock:
	register_versionadmin_proxy(versionable, site)
	message = f"{Version!r} is already registered with admin."
	mock.assert_called_with(message, UserWarning, stacklevel=2)

[codecov]

Codecov Report

Merging #329 (09df193) into master (0d006ce) will not change coverage.
The diff coverage is 83.13%.

@@           Coverage Diff           @@
##           master     #329   +/-   ##
=======================================
  Coverage   90.53%   90.53%           
=======================================
  Files          68       68           
  Lines        2324     2324           
  Branches      314      314           
=======================================
  Hits         2104     2104           
  Misses        165      165           
  Partials       55       55           

Impacted Files	Coverage Δ
djangocms_versioning/compat.py	100.00% <ø> (ø)
djangocms_versioning/conf.py	100.00% <ø> (ø)
..._versioning/management/commands/create_versions.py	95.55% <0.00%> (ø)
djangocms_versioning/operations.py	100.00% <ø> (ø)
djangocms_versioning/signals.py	100.00% <ø> (ø)
...ms_versioning/templatetags/djangocms_versioning.py	100.00% <ø> (ø)
...st_utils/incorrectly_configured_blogpost/models.py	80.00% <0.00%> (ø)
djangocms_versioning/test_utils/people/models.py	76.92% <0.00%> (ø)
...ioning/test_utils/polls/templatetags/polls_tags.py	66.66% <ø> (ø)
...ioning/test_utils/unversioned_editable_app/urls.py	0.00% <ø> (ø)
... and 19 more