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

All modified and coverable lines are covered by tests ✅

Comparison is base (7c2612c) 85.93% compared to head (04520e8) 85.94%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #36   +/-   ##
=======================================
  Coverage   85.93%   85.94%           
=======================================
  Files         105      105           
  Lines       12130    12130           
=======================================
+ Hits        10424    10425    +1     
+ Misses       1706     1705    -1     

see 2 files with indirect coverage changes

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