chore(deps): update dependency phpunit/phpunit to v9.3.9

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
phpunit/phpunit (source)	require-dev	patch	9.3.8 -> 9.3.9

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Release Notes

sebastianbergmann/phpunit

### [`v9.3.9`](https://togithub.com/sebastianbergmann/phpunit/compare/9.3.8...9.3.9) [Compare Source](https://togithub.com/sebastianbergmann/phpunit/compare/9.3.8...9.3.9)

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