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

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v2 -> v4

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Release Notes

actions/checkout (actions/checkout)

v4

Compare Source

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

v3

Compare Source

• Fix: Mark test scripts with Bash'isms to be run via Bash
• Add option to fetch tags even if fetch-depth > 0

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Configuration

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@74e0a5f). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #120   +/-   ##
=======================================
  Coverage        ?   95.73%           
=======================================
  Files           ?       15           
  Lines           ?      211           
  Branches        ?       43           
=======================================
  Hits            ?      202           
  Misses          ?        9           
  Partials        ?        0           

Flag	Coverage Δ
unittests	95.73% <0.00%> (?)

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[renovate]

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