Improve the CI setup

[stof]

• add CI jobs for PHP 8.4
• update actions used in workflows

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.42%. Comparing base (345f695) to head (ae56ab7).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #413      +/-   ##
============================================
- Coverage     86.07%   85.42%   -0.65%     
  Complexity      184      184              
============================================
  Files             1        1              
  Lines           510      501       -9     
============================================
- Hits            439      428      -11     
- Misses           71       73       +2     

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