Run tests with PHPUnit 12

[Art4]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.63%. Comparing base (8626fa7) to head (669b0b7).
Report is 3 commits behind head on v2.x.

Additional details and impacted files

@@            Coverage Diff            @@
##               v2.x     #446   +/-   ##
=========================================
  Coverage     98.63%   98.63%           
  Complexity      659      659           
=========================================
  Files            29       29           
  Lines          2056     2056           
=========================================
  Hits           2028     2028           
  Misses           28       28           

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