Update extractions/setup-just action to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
extractions/setup-just	action	major	v3 → v4

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Release Notes

extractions/setup-just (extractions/setup-just)

v4.0.0

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (0e1f20a) to head (fbe667a).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #309   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           34        34           
  Branches         1         1           
=========================================
  Hits            34        34           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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