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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[changeset-bot]

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Latest commit: 8782fac

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.43%. Comparing base (10d7b68) to head (8782fac).
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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #228   +/-   ##
=======================================
  Coverage   67.43%   67.43%           
=======================================
  Files          19       19           
  Lines         611      611           
  Branches      106      106           
=======================================
  Hits          412      412           
  Misses        195      195           
  Partials        4        4           

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