Update dependency phpunit/phpunit to v9.5.26

This PR contains the following updates:

Package	Type	Update	Change
phpunit/phpunit (source)	require-dev	patch	`9.5.25` -> `9.5.26`

Release Notes

sebastianbergmann/phpunit

### [`v9.5.26`](https://togithub.com/sebastianbergmann/phpunit/compare/9.5.25...9.5.26) [Compare Source](https://togithub.com/sebastianbergmann/phpunit/compare/9.5.25...9.5.26)

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Mather-Sophi / sophi-for-wordpress

Update dependency phpunit/phpunit to v9.5.26 #349

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