Update the CI setup

[stof]

• add CI jobs using PHP 8.4 and 8.5
• use PHP 8.4 as default PHP version
• update actions used in workflows

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.05%. Comparing base (66a0bd1) to head (558b0df).

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #65      +/-   ##
============================================
- Coverage     88.14%   88.05%   -0.09%     
  Complexity      197      197              
============================================
  Files             1        1              
  Lines           506      494      -12     
============================================
- Hits            446      435      -11     
+ Misses           60       59       -1     

Flag	Coverage Δ
chrome	87.04% <ø> (+0.28%)	⬆️
chromium	?
edge	?
firefox	88.05% <ø> (+0.70%)	⬆️
selenium-2.53.1	85.22% <ø> (-0.36%)	⬇️
selenium-3	88.05% <ø> (+0.70%)	⬆️
selenium-4	88.05% <ø> (+0.50%)	⬆️

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