chore(deps): update php-actions/phpunit action to v4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
php-actions/phpunit	action	major	v3 -> v4

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Release Notes

php-actions/phpunit (php-actions/phpunit)

### [`v4`](https://togithub.com/php-actions/phpunit/releases/tag/v4): .0.0 [Compare Source](https://togithub.com/php-actions/phpunit/compare/v3...v4) > # Important note about versioning > > **In this release, GitHub have changed to an auto-tagging model, where the release will be made as `vX.Y.Z` and an automatic tag is created called `vX`, so there will be no more proxy releases for the latest version number - just use `v4` from now on!** #### What's Changed - support --coverage-filter flag by [@​shish](https://togithub.com/shish) in [https://github.com/php-actions/phpunit/pull/60](https://togithub.com/php-actions/phpunit/pull/60) - Use composer version of PHPUnit by default if availble by [@​g105b](https://togithub.com/g105b) in [https://github.com/php-actions/phpunit/pull/61](https://togithub.com/php-actions/phpunit/pull/61) - Revert phpbuild (docker user) by [@​g105b](https://togithub.com/g105b) in [https://github.com/php-actions/phpunit/pull/63](https://togithub.com/php-actions/phpunit/pull/63) - Remove the default value for the test_suffix parameter by [@​cookieguru](https://togithub.com/cookieguru) in [https://github.com/php-actions/phpunit/pull/64](https://togithub.com/php-actions/phpunit/pull/64) #### New Contributors - [@​shish](https://togithub.com/shish) made their first contribution in [https://github.com/php-actions/phpunit/pull/60](https://togithub.com/php-actions/phpunit/pull/60) - [@​cookieguru](https://togithub.com/cookieguru) made their first contribution in [https://github.com/php-actions/phpunit/pull/64](https://togithub.com/php-actions/phpunit/pull/64) **Full Changelog**: https://github.com/php-actions/phpunit/compare/v3.0.3...v4

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