Update PHPStan packages to ^2.0.16 (main)

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
phpstan/phpstan-phpunit	^2.0 → ^2.0.16

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.04%. Comparing base (b6a53ab) to head (5dd918e).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1217   +/-   ##
=========================================
  Coverage     98.04%   98.04%           
  Complexity     1622     1622           
=========================================
  Files           114      114           
  Lines          5429     5429           
=========================================
  Hits           5323     5323           
  Misses          106      106           

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