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

Merging #46 (2954c11) into main (4a834dc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #46   +/-   ##
=======================================
  Coverage   96.92%   96.92%           
=======================================
  Files           4        4           
  Lines         195      195           
=======================================
  Hits          189      189           
  Misses          6        6           

Flag	Coverage Δ
macos-latest	96.92% <ø> (ø)
ubuntu-latest	96.92% <ø> (ø)
windows-latest	96.92% <ø> (ø)

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