Update actions/checkout action to v4

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v3 -> v4

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Release Notes

actions/checkout (actions/checkout)

v4

Compare Source

• Check out other refs/* by commit if provided, fall back to ref by @​orhantoy in https://github.com/actions/checkout/pull/1924

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Configuration

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[dashpole]

/gcbrun

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.02%. Comparing base (4caace7) to head (fd4e6b5).
Report is 110 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #991      +/-   ##
==========================================
+ Coverage   61.03%   64.02%   +2.98%     
==========================================
  Files          56       57       +1     
  Lines        5903     6018     +115     
==========================================
+ Hits         3603     3853     +250     
+ Misses       2143     2004     -139     
- Partials      157      161       +4     

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