PHP 8.1 compatibility

[x3wil]

Fixed deprecated message:

Return type of Phing\Type\FileList::getIterator() should either be compatible with IteratorAggregate::getIterator():Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /vendor/phing/phing/src/Phing/Type/FileList.php:88

[codecov]

Codecov Report

Merging #1652 (e2f5d98) into main (0ffdf1c) will not change coverage.
The diff coverage is n/a.

❗ Current head e2f5d98 differs from pull request most recent head ee52a0d. Consider uploading reports for the commit ee52a0d to get more accurate results

@@            Coverage Diff            @@
##               main    #1652   +/-   ##
=========================================
  Coverage     58.14%   58.14%           
  Complexity     7007     7007           
=========================================
  Files           356      356           
  Lines         16912    16912           
=========================================
  Hits           9833     9833           
  Misses         7079     7079           

Impacted Files	Coverage Δ
src/Phing/Type/FileList.php	52.85% <ø> (ø)

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