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 97.54%. Comparing base (a3e2c80) to head (5ef228a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #758   +/-   ##
=======================================
  Coverage   97.54%   97.54%           
=======================================
  Files         148      148           
  Lines        1302     1302           
  Branches      225      225           
=======================================
  Hits         1270     1270           
  Misses         31       31           
  Partials        1        1           

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