ci: update actions/checkout from v4 -> v7 and codecov/codecov-action from v5 -> v7

[DatGreekChick]

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[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d6b8b44) to head (6552a6b).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #462   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          114       114           
=========================================
  Hits           114       114           

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[github-actions]

🎉 This PR is included in version 3.2.1 🎉

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