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

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v5 → v6

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Release Notes

actions/checkout (actions/checkout)

v6

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 54.45%. Comparing base (53af876) to head (4628eec).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #614      +/-   ##
==========================================
+ Coverage   54.43%   54.45%   +0.01%     
==========================================
  Files          56       56              
  Lines       10615    10615              
==========================================
+ Hits         5778     5780       +2     
+ Misses       4837     4835       -2     

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