⬆️ Upgrade dependency phpunit/phpunit to v12.5.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
phpunit/phpunit (source)	12.5.8 → 12.5.9

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Release Notes

sebastianbergmann/phpunit (phpunit/phpunit)

v12.5.9: PHPUnit 12.5.9

Compare Source

Added

• #​6488: Allow disabling issue trigger identification for improved performance

Fixed

• #​6486: Incorrect file name reported for errors for test methods declared in traits
• #​6490: Incorrect test count when tests are skipped in before-class method

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