Update dependency phpunit/phpunit to v12.5.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
phpunit/phpunit (source)	12.5.6 → 12.5.7

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Release Notes

sebastianbergmann/phpunit (phpunit/phpunit)

v12.5.7: PHPUnit 12.5.7

Compare Source

Fixed

• #​6362: Manually instantiated test doubles are broken since PHPUnit 11.2
• #​6470: Infinite recursion in Count::getCountOf() for unusal implementations of Iterator or IteratorAggregate

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