Enhancement: Add support for phpunit/phpunit:^12.0.0

[localheinz]

This pull request

• adds support for phpunit/phpunit:^12.0.0

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 56.14%. Comparing base (b226bff) to head (a4041a1).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Extension.php	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #651      +/-   ##
============================================
+ Coverage     56.10%   56.14%   +0.04%     
- Complexity      116      117       +1     
============================================
  Files            28       28              
  Lines           672      675       +3     
============================================
+ Hits            377      379       +2     
- Misses          295      296       +1     

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