Target ruby 3 with rubocop

[ellnix]

Rubocop's config was still enforcing ruby 2 code style. This is just a step that was missing in #367.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.90%. Comparing base (c4abc60) to head (451f931).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #370   +/-   ##
=======================================
  Coverage   88.90%   88.90%           
=======================================
  Files          13       13           
  Lines         757      757           
=======================================
  Hits          673      673           
  Misses         84       84           

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[curquiza]

@ellnix sorry can you fix the git conflicts? 🙈

[ellnix]

@ellnix sorry can you fix the git conflicts? 🙈

Apologies for ghosting for so long, fixed the conflict (it was an edit to a file that has since been deleted)

[brunoocasali]

bors merge

[meili-bors]

Build succeeded:

• integration-tests (Rails 6.1 with Ruby 3.0)
• integration-tests (Rails 6.1 with Ruby 3.1)
• integration-tests (Rails 6.1 with Ruby 3.2)
• integration-tests (Rails 7 with Ruby 3.0)
• integration-tests (Rails 7 with Ruby 3.1)
• integration-tests (Rails 7 with Ruby 3.2)
• linter-check
• smoke-test