Require Rails 7.2

[AlistairNorman]

Summary

Rails 7.0 and 7.1 are no longer maintained.

Checklist

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• I agree that my PR will be published under the same license as Solidus.
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.50%. Comparing base (e1dadca) to head (3fcc174).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6414   +/-   ##
=======================================
  Coverage   89.50%   89.50%           
=======================================
  Files         981      981           
  Lines       20476    20476           
=======================================
  Hits        18327    18327           
  Misses       2149     2149           

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[AlistairNorman]

No changes in the last push, just rebased onto main to keep this up to date.

[tvdeyen]

Do you mind tackling the linting issues as well?

[AlistairNorman]

Do you mind tackling the linting issues as well?

They're in main, not related to this PR, but yes I can take a look at them.

[AlistairNorman]

I just rebased this onto main to get the fixes for linting