Tooling updates

[zerolab]

• switches to using ruff with more checks
• linting
• updates to python linting/testing dependencies
• adds Wagtail 5.1 to the test matrix

[codecov-commenter]

Codecov Report

Attention: 26 lines in your changes are missing coverage. Please review.

Comparison is base (f4e312b) 93.29% compared to head (4c538e0) 92.73%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #723      +/-   ##
==========================================
- Coverage   93.29%   92.73%   -0.56%     
==========================================
  Files          47       47              
  Lines        3921     3964      +43     
  Branches      583      587       +4     
==========================================
+ Hits         3658     3676      +18     
- Misses        153      174      +21     
- Partials      110      114       +4     

Files	Coverage Δ
wagtail_localize/components.py	85.71% <100.00%> (ø)
wagtail_localize/locales/views.py	97.22% <100.00%> (ø)
wagtail_localize/machine_translators/deepl.py	66.66% <ø> (ø)
wagtail_localize/modeladmin/helpers.py	100.00% <ø> (ø)
wagtail_localize/modeladmin/options.py	93.33% <ø> (ø)
wagtail_localize/modeladmin/tests.py	100.00% <ø> (ø)
wagtail_localize/modeladmin/views.py	98.09% <100.00%> (ø)
wagtail_localize/segments/__init__.py	100.00% <100.00%> (ø)
wagtail_localize/test/settings.py	100.00% <100.00%> (ø)
wagtail_localize/views/convert.py	76.81% <100.00%> (ø)
... and 7 more

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