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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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.96%. Comparing base (76e2784) to head (c30e7cc).
⚠️ Report is 1 commits behind head on 1.x.

Additional details and impacted files

@@           Coverage Diff           @@
##              1.x     #263   +/-   ##
=======================================
  Coverage   78.96%   78.96%           
=======================================
  Files           8        8           
  Lines         485      485           
=======================================
  Hits          383      383           
  Misses        102      102           

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