fix(deps): roll back actions/checkout action to v4.0.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	rollback	v4.1.0 -> v4.0.0

Warnings (1)

Please correct - or verify that you can safely ignore - these warnings before you merge this PR.

• actions/checkout: Could not determine new digest for update (github-tags package actions/checkout)

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[codecov]

Codecov Report

Merging #203 (891337f) into master (a146900) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #203   +/-   ##
=========================================
  Coverage     90.90%   90.90%           
  Complexity       17       17           
=========================================
  Files             1        1           
  Lines            22       22           
=========================================
  Hits             20       20           
  Misses            2        2           

Flag	Coverage Δ
unittests	90.90% <ø> (ø)

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