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

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.36%. Comparing base (35b4ee9) to head (a8d6f7d).
⚠️ Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #368   +/-   ##
=========================================
  Coverage     81.36%   81.36%           
  Complexity       69       69           
=========================================
  Files            16       16           
  Lines           220      220           
=========================================
  Hits            179      179           
  Misses           41       41           

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