Update dependency phpunit/phpunit to v11.1.1

This MR contains the following updates:

Package	Type	Update	Change
phpunit/phpunit (source)	require-dev	patch	11.1.0 -> 11.1.1

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Release Notes

sebastianbergmann/phpunit (phpunit/phpunit)

v11.1.1: PHPUnit 11.1.1

Compare Source

Fixed

• #​5798: The #[CoversClass] and #[UsesClass] attributes can no longer target traits

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