chore(deps): update dependency phpunit/phpunit to v9.6.28

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This PR contains the following updates:

Package	Change	Age	Confidence
phpunit/phpunit (source)	9.6.26 -> 9.6.28

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Release Notes

sebastianbergmann/phpunit (phpunit/phpunit)

v9.6.28

Compare Source

v9.6.27: PHPUnit 9.6.27

Compare Source

Changed

• #​6366: Exclude __sleep() and __wakeup() from test double code generation on PHP >= 8.5

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