chore(deps): update php-actions/phpunit action to v9

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	Change
php-actions/phpunit	action	major	v3 -> v9

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Release Notes

php-actions/phpunit

v9

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This is the latest stable release of PHPUnit, other versions of the action are based from this one.

v8

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This is a backport of functionality that runs PHPUnit at version 8.

v7

Compare Source

This is a backport of functionality that runs PHPUnit at version 7.

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Configuration

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