Update dependency phpunit/phpunit to v12.5.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
phpunit/phpunit (source)	12.5.5 → 12.5.6

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Release Notes

sebastianbergmann/phpunit (phpunit/phpunit)

v12.5.6: PHPUnit 12.5.6

Compare Source

Changed

• Reverted a change that caused a build failure for the PHP project's nightly community job

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Learn how to install or update PHPUnit 12.5 in the documentation.

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