Bump 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 65.01%. Comparing base (9f78825) to head (64a68cb).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #521   +/-   ##
=======================================
  Coverage   65.01%   65.01%           
=======================================
  Files          59       59           
  Lines        1941     1941           
  Branches      381      381           
=======================================
  Hits         1262     1262           
  Misses        568      568           
  Partials      111      111           

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