Fix Psalm baseline issues

[HaruAtari]

Fix the InvalidPropertyAssignmentValue psalm issue in the \PHPUnit\Util\ExcludeList class

For the #4093

[codecov[bot]]

Codecov Report

Merging #5355 (e27e1aa) into main (1eaedf8) will decrease coverage by 0.01%. The diff coverage is 75.00%.

@@             Coverage Diff              @@
##               main    #5355      +/-   ##
============================================
- Coverage     84.88%   84.88%   -0.01%     
- Complexity     6109     6111       +2     
============================================
  Files           651      651              
  Lines         19345    19347       +2     
============================================
+ Hits          16421    16422       +1     
- Misses         2924     2925       +1     

Impacted Files	Coverage Δ
src/Util/ExcludeList.php	94.11% <75.00%> (-2.76%)	:arrow_down:

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[sebastianbergmann]

Thank you for your contribution. I appreciate the time you invested in preparing this pull request. However, I have decided not to merge it.