Update dependency phpunit/phpunit to v11.5.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
phpunit/phpunit (source)	11.5.2 -> 11.5.6

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Release Notes

sebastianbergmann/phpunit (phpunit/phpunit)

v11.5.6

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v11.5.5

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v11.5.4

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v11.5.3: PHPUnit 11.5.3

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Added

• Test\AfterLastTestMethodErrored, Test\AfterTestMethodErrored, Test\BeforeTestMethodErrored, Test\PostConditionErrored, and Test\PreConditionErrored events

Fixed

• #​6093: Test Double Code Generator does not work when PHPUnit is used from PHAR on PHP 8.4
• #​6094: Errors in after-last-test methods are not reported
• #​6095: Expectation is not counted correctly when a doubled method is called more often than is expected
• #​6096: --list-tests-xml is broken when a group with a numeric name is defined
• #​6098: No system-out element in JUnit XML logfile
• #​6100: Suppressed deprecations incorrectly stop test execution when execution should be stopped on deprecation

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