Fix: Use Xdebug instead of pcov for collecting code coverage

[localheinz]

This pull request

• uses Xdebug instead of pcov for collecting code coverage

[codecov]

Codecov Report

Merging #391 (0c981bc) into main (1687e7f) will decrease coverage by 5.99%.
The diff coverage is n/a.

❗ Current head 0c981bc differs from pull request most recent head 6f87dff. Consider uploading reports for the commit 6f87dff to get more accurate results

@@             Coverage Diff              @@
##               main     #391      +/-   ##
============================================
- Coverage     90.06%   84.07%   -6.00%     
  Complexity      151      151              
============================================
  Files            23       23              
  Lines           433      496      +63     
============================================
+ Hits            390      417      +27     
- Misses           43       79      +36     

Impacted Files	Coverage Δ
...c/Closures/NoNullableReturnTypeDeclarationRule.php	63.63% <0.00%> (-14.15%)	⬇️
src/Expressions/NoCompactRule.php	61.53% <0.00%> (-11.19%)	⬇️
.../Functions/NoNullableReturnTypeDeclarationRule.php	69.23% <0.00%> (-10.77%)	⬇️
...res/NoParameterWithNullableTypeDeclarationRule.php	80.00% <0.00%> (-8.24%)	⬇️
src/Files/DeclareStrictTypesRule.php	82.60% <0.00%> (-7.87%)	⬇️
...c/Closures/NoParameterWithNullDefaultValueRule.php	81.81% <0.00%> (-7.66%)	⬇️
...ons/NoParameterWithNullableTypeDeclarationRule.php	81.81% <0.00%> (-7.66%)	⬇️
...rc/Methods/NoNullableReturnTypeDeclarationRule.php	80.00% <0.00%> (-7.50%)	⬇️
.../Functions/NoParameterWithNullDefaultValueRule.php	83.33% <0.00%> (-7.15%)	⬇️
src/Methods/PrivateInFinalClassRule.php	84.00% <0.00%> (-6.91%)	⬇️
... and 8 more

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