deps(renovate): update actions/checkout action to v4

[renovate]

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

• Support fetching without the --progress option
• Update to node20

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Configuration

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.22%. Comparing base (1932927) to head (2b78b7b).
Report is 2 commits behind head on main.

❗ Current head 2b78b7b differs from pull request most recent head 080723c. Consider uploading reports for the commit 080723c to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #286   +/-   ##
=======================================
  Coverage   97.22%   97.22%           
=======================================
  Files           5        5           
  Lines         361      361           
  Branches       48       48           
=======================================
  Hits          351      351           
  Misses         10       10           

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