Fully support PHP 8.2, 8.3 and 8.4

[marc-mabe]

• Run tests in PHP 8.2, 8.3 and 8.4
• fixed deprecation warning "implicitly nullable via default value null"
• fixed deprecation warning "Calling ReflectionProperty::setValue() with a single argument is deprecated"
• use xdebug instead of pcov

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.47%. Comparing base (3da42cc) to head (03a4a88).

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #160      +/-   ##
============================================
- Coverage     99.81%   99.47%   -0.35%     
+ Complexity      227      224       -3     
============================================
  Files             4        4              
  Lines           555      574      +19     
============================================
+ Hits            554      571      +17     
- Misses            1        3       +2     

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