chore(deps): update actions/checkout action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v4 → v6

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Release Notes

actions/checkout (actions/checkout)

v6

Compare Source

v5

Compare Source

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Configuration

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.79%. Comparing base (b3dbc3f) to head (90ba7f1).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #218   +/-   ##
=======================================
  Coverage   27.79%   27.79%           
=======================================
  Files           7        7           
  Lines         259      259           
  Branches       23       23           
=======================================
  Hits           72       72           
  Misses        183      183           
  Partials        4        4           

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