chore(deps): bump phpunit/phpunit from 9.6.17 to ^9.6.18

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
phpunit/phpunit (source)	^9.6.17 -> ^9.6.18

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Release Notes

sebastianbergmann/phpunit (phpunit/phpunit)

### [`v9.6.18`](https://togithub.com/sebastianbergmann/phpunit/compare/9.6.17...9.6.18) [Compare Source](https://togithub.com/sebastianbergmann/phpunit/compare/9.6.17...9.6.18)

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