Wagtail 7.1 maintenance

[nickmoreton]

This pull request add Wagtail 7.1 to the test matrix

I'm hoping it follows your pattern to cover the versions adequately. Happy to adjust it if need be.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.09%. Comparing base (420d774) to head (02d8351).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #877      +/-   ##
==========================================
+ Coverage   93.07%   93.09%   +0.02%     
==========================================
  Files          47       47              
  Lines        4244     4242       -2     
  Branches      551      551              
==========================================
- Hits         3950     3949       -1     
+ Misses        175      174       -1     
  Partials      119      119              

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