ci: bump actions/checkout 5 => 6

[Chris53897]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.81%. Comparing base (36a1cb2) to head (df45c91).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #215   +/-   ##
=========================================
  Coverage     70.81%   70.81%           
  Complexity      994      994           
=========================================
  Files            49       49           
  Lines          3169     3169           
=========================================
  Hits           2244     2244           
  Misses          925      925           

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