chore(deps): update dependency phpunit/phpunit to v9.6.21

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
phpunit/phpunit (source)	9.6.19 -> 9.6.21

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Release Notes

sebastianbergmann/phpunit (phpunit/phpunit)

v9.6.21

Compare Source

v9.6.20: PHPUnit 9.6.20

Compare Source

Changed

• Updated dependencies (so that users that install using Composer's --prefer-lowest CLI option also get recent versions)

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How to install or update PHPUnit

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