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 93.10%. Comparing base (2fc6f1c) to head (d8e88dc).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #800   +/-   ##
=======================================
  Coverage   93.10%   93.10%           
=======================================
  Files           5        5           
  Lines         348      348           
  Branches       57       73   +16     
=======================================
  Hits          324      324           
  Misses         24       24           

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